COMMON PARTS - DBU

Locking switch used on the Telephone No. 280.

Called a Button, Dummy, this was used to fill the button hole in a Telephone No. 706 with cover Part DCO/612).

Made from Polymethyl Methacrylate (Parts 1/) and Acrylonitrile Butadiene (Parts 2/) from 1964 onwards.

Colours:-
Black, Grey, Green, Yellow, Ivory, Red and Blue.
 

Called a Button, these were in fact feet that were used on the Telephone No's 706 and 710.

Made of Vulcanised Chloroprene compound.

The 1/DBU/259 (introduced 1961) had a domed base, whilst the 2/DBU/259 (introduced 1962) had a recess.  It was found that the 1/DBU/259 slid very easily and the 2/DBU/259 was then fitted to all telephones.

Ericsson Part N91340.
 

Non locking button for use on the Telephone No. 710 embossed with numerous white, black or red (Parts 48-50) coloured legends.

The engraving is on the front face of the buttons.

Parts 1-17/DBU/260 were superseded by Parts 21-37/DBU/260.

Made from Polymethyl Methacrylate (Parts 1-17/) and Acrylonitrile Butadiene (Parts 21-42/).

Colours:
Grey, ivory and black.

Legends
21/ Blank
22/ EXCH
23/ EXTN
24/ MAIN
25/ 1
26/ 2
27/ 3
28/ RECALL
29/ 4
30/ KIOSK
31/ PAY
32/ BUZZ C.O.
33/ SEC'T
34/ NORM
35/ HEAD SET
36/ ENQY
37/ LINE 2
38/ AUTO ANS
39/ DATE
40/ TELE
41/ BKD CALL
42/ RECD CALL
43/ TEST
44/ SEND DATA
45/ REC DATA
46/ ST'BY
47/ CALL
48/ DATA PSTN
49/ TELE
50/ DATA

 

Called a Button, Dummy, this was used to fill unused button holes in a Telephone No. 710 with cover Part DCO/648.

Made from Polymethyl Methacrylate (Parts 1/) and Acrylonitrile Butadiene (Parts 2/) from 1963 onwards.

Colours:
Grey, ivory and black.
 

Locking button for use on the Telephone No. 710 embossed with numerous white or black coloured legends.  There is a slide on the top of the button which latches under the fixing pin holding the button down.

The button is retained by means of a Pin, Part 1/DPI/205.

Made from A.B.S. Moulding material.

Colours:
Grey, ivory and black.

Legends
1/ - Blank
2/ ON OFF (Cancelled in 1963)
3/ BELL OFF
4/ NS
5/ ST'BY
6/ TELE
7/ AUTO ANS
8/ OFF PW
 

Non-locking button embossed PRESS.

Made from Polymethyl Methacrylate.

Colours:-
Black, Grey, Green, Yellow, Ivory, Red and Blue.

Used with a Switch No. 5A-3 when fitted to a Telephone No. 706.

Superseded by 3/DBU/263
 

Non-locking button not embossed.

Made from Polymethyl Methacrylate.

Colours:-
Black, Grey, Green, Yellow, Ivory, Red and Blue.

Used with a Switch No. 5A-3 when fitted to a Telephone No. 706.

Superseded by 4/DBU/263
 

Non-locking button embossed PRESS.

Made from Acrylonitrile Butadiene.

Colours:-
Black, Grey, Green, Yellow, Ivory, Red and Blue.

Used with a Switch No. 5A-3 when fitted to a Telephone No. 706.
 

Non-locking button not embossed.

Made from Acrylonitrile Butadiene.

Colours:-
Black, Grey, Green, Yellow, Ivory, Red and Blue.

Used with a Switch No. 5A-3 when fitted to a Telephone No. 706.
 

Non-locking button embossed RECALL.

Made from Acrylonitrile Butadiene.

Colours:-
Black, Grey, Green, Yellow, Ivory, Red and Blue.

Used with a Switch No. 5A-3 when fitted to a Telephone No. 706.

Introduced in 1975.
 

Locking button embossed ON OFF.

Colours:-
Black, Grey, Green, Yellow, Ivory, Red and Blue.

Used with a Switch No. 5A-3 when fitted to a Telephone No. 706.
 

Locking button not embossed.

Colours:-
Black, Grey, Green, Yellow, Ivory, Red and Blue.

Used with a Switch No. 5A-3 when fitted to a Telephone No. 706.
 

Locking button on a Handset No. 6.
 

Non-Locking button for used with a Switch No. 5A-3 when fitted in a Telephone No. 711.

There is no legend on this button.

Made from Acrylonitrile Butadiene Styrene Copolymer.

Colours:-
Black, Grey and Ivory.
 

Non-Locking button for used with Switch No. 5A-3 when fitted in a Telephone No. 711.

Printed with the legend "Press".

Made from Acrylonitrile Butadiene Styrene Copolymer.

Colours:-
Black, Grey and Ivory.
 

Locking button for used with Switch No. 5A-3 when fitted in a Telephone No. 711.

There is no legend on this button.

Made from Acrylonitrile Butadiene Styrene Copolymer.

Colours:-
Black, Grey and Ivory.
 

Locking button for used with Switch No. 5A-3 when fitted in a Telephone No. 711.

Made from Acrylonitrile Butadiene Styrene Copolymer.

Printed with the legend "Press".

Colours:-
Black, Grey and Ivory.
 

Quarter length buttons, embossed with numerous legends, used on a for Frame, Latching Part 1/DFR/107 which could be fitted on a Telephone No. 711.

Made from Acrylonitrile Butadiene Styrene Copolymer.

Made by GEC.

Colours:-
Black, Grey and Ivory.

Legends
1/ Blank
2/ EXCH
3/ EXTN
4/ MAIN
5/ 1
6/ 2
7/ 3
8/ RECALL
9/ 4
10/ OFF ON

Superseded by Parts 1/DBU/378.
 

Half length buttons, embossed with numerous legends, used on a for Frame, Latching Part 1/DFR/107 which could be fitted on a Telephone No. 711.

Made from Acrylonitrile Butadiene Styrene Copolymer.

Made by GEC.

Colours:-
Black, Grey and Ivory.

Legends
1/ Blank
2/ EXCH
3/ EXTN
4/ MAIN
5/ 1
6/ 2
7/ RECALL

Superseded by Parts 1/DBU/379.
 

Blank plate called a Button, Dummy, which was used on the Telephone No. 711 to fill the space either side of a Part /DBU/266 or /DBU/267.  Two would be required.

Fixed in place with one metal spring clip: Part 1/DSP/510.

Made from Acrylonitrile Butadiene Styrene Copolymer.

Made by GEC.

Colours:-
Black, Grey and Ivory.
 

Full length blank plate called a Button, Dummy, which was fitted to the Telephone No. 711 when no buttons are installed.

Fixed in place with two metal spring clips: Part 1/DSP/510.

Made from Acrylonitrile Butadiene Styrene Copolymer.

Made by GEC.

Colours:-
Black, Grey and Ivory.
 

A non-locking button fitted to a Switch No. 5A-7 which may be installed in a Telephone No. 713.

Made from Acrylonitrile Butadiene Styrene Copolymer.

1/DBU/344 - engraved RECALL.
2/DBU/344 - no engraving.

Colour:-
Grey.
 

A locking button fitted to a Switch No. 5A-7 which may be installed in a Telephone No. 713.

Made from Acrylonitrile Butadiene Styrene Copolymer.

1/DBU/344 - engraved OFF ON.
2/DBU/344 - no engraving.

Colour:-
Grey.
 

A dummy button hole cover used on a  Telephone No. 713 with cover /DCO/673.

Made from Acrylonitrile Butadiene Styrene Copolymer.

Colour:-
Grey.
 

A non-Locking button with numerous engravings, in white and on the top face, that are used on the Loudspeaking Telephone No. 4A.

Made from Acrylonitrile Butadiene Styrene Copolymer.

Legends
1/ ENQY
2/ EXCH
3/ EXTN
4/ MAIN
5/ 1
6/ 2
7/ 3
4/ REC'L
9/ 4
10/ SEC'T
11/ NORM
12/ PRESS

Colour:-
Grey.
 

A blank button called a Button, Dummy, which was fitted to the Telephone No. 740 with cover Part /DCO/694.

Made from Acrylonitrile Butadiene Styrene Copolymer.

Colours:-
Black, Grey and Ivory.

A transparent button, with numerous legends, that fitted the Telephone No. 746.  These buttons require a two retaining pins (1/DPI/203) and a Plunger (1/DPL/1002).

Made from Polymethyl Methacrylate.

Legends
1/ Blank
2/ ON / OFF
3/ HEADSET
4/ RECALL
 

A transparent button, with numerous legends, that fitted the Telephone No. 746.  These are half the size of the /DBU/362 and  a retaining pin (1/DPI/203) and a Plunger (1/DPL/1002) are required for each button.  Always fitted in pairs.

Made from Polymethyl Methacrylate.

Legends
1/ Blank
2/ ON /OFF
3/ EXCH
4/ MAIN
5/ 1
6/ 2
7/ RECALL
 

A blank, called a Button, Dummy that is fitted on the top of the case of a Telephone No. 746 with a cover 1/DCO/718.

The 1/DBU/367 was fixed by a metal spring, but this was superseded in 1969 by the 2/DBU/367 which had moulded protrusions by which to hold the dummy in place.

Made from A.B.S.

Colours:-
Black, Grey, Green, Yellow, Ivory, Red and Blue.
 

Part 1/DBU/367 is shown at the top
Part 2/DBU/367 are shown at the bottom

A blank cover that fits at the front of the base of a Telephone No. 722.  This plate is removed if a switch is installed.

A transparent button, with numerous legends, that fitted the Telephone No. 740.  A retaining pin (1/DPI/203) and a Plunger (1/DPL/1002) are required for each button.

Engraving colour is black except for 26 and 28 which are white and 27, 29, 30 and 32 which are red.

Made from Polymethyl Methacrylate.

Legends
1/ Blank
2/ EXCH
3/ EXTN
4/ MAIN
5/ 1
6/ 2
7/ 3
8/ RECALL
9/ 4
10/ OFF ON
11/ AUTO ANS
12/ DATA
13/ TELE
14/ BKD CALL
15/ REC'D CALL
16/ TEST
17/ SEND DATA
18/ REC DATA
19/ HOLD
20/ SEC'T
21/ NORM
22/ ST'BY
23/ HEAD SET
24/ NS
25/ CALL
26/ OFF PW
27/ DATA PSTN
28/ TELE
29/ TELE
30/ DATA
31/ LINE 1/2
32/ TELE / DATA

Blank buttons called a Button, Dummy, which were fitted to the Telephone No. 740 with cover Part /DCO/730.

Due to the curve of the top of the casing four different buttons are required with slightly different mouldings.

The parts are numbered left to right.

Made from Acrylonitrile Butadiene Styrene Copolymer.

Colours:-
Black, Grey and Ivory.

Quarter length button, with a transparent cover, used on a for Frame, Latching Part 1/DFR/107 which could be fitted on a Telephone No. 711.  A label A6644, with a printed legend, would be fitted under the transparent cover.

Colours
Grey and ivory.

These superseded the /DBU/268.

Half length button, with a transparent cover, used on a for Frame, Latching Part 1/DFR/107 which could be fitted on a Telephone No. 711.  A paper Label A6644, with a printed legend, would be fitted under the transparent cover.

Colours
Grey and ivory.

These superseded the /DBU/269.