NATIONAL TELEPHONE COMPANY
The same general remarks apply as in the case of Patterns Nos. B625 and B630 and, further, the Line Selectors of both patterns (Nos. B635 and B640) are fitted with a mechanical click which reduces the risk of making contact with two stations at once.
5, 10, 15, 20, 25 & 30 line models.
Was B91 in the 1903 Catalogue.
Last revised: July 07, 2020