Under which a paper label bearing station numbers, etc. The operating procedure for the keys is described in Adjacent to the keys is a window The conference key marked 'C ' (coloured green). Surface of the telephone is a row of 7 plunger keys comprising, at the top, theĮxchange-line key (coloured red), followed by 5 black local-call keys and, below these, 4) with a cradle restįor the telephone handset ( Telephone No. x 5 in., and is enclosed in a black, moulded cover (Cover No. The mechanism is mounted on a metal base, measuring approximately 11 Telephone is used on installations having one exchange line and five (or exceptionally, Respects, these telephones will be as described elsewhere in this Instruction for items Telephones with the new plungers willīe distinguished by the addition of the letter A asĪ suffix to the mark number, e.g., Telephone, Intercom, No. With a new type of handset plunger, designed to reduce the possibility of sticking. These telephonesįuture supplies of Telephones, Intercom, Nos. House exchange system, Telephone, Intercom, No. Where a hearing-aid amplifier is required at a multiple station on the Provided with a tray but are otherwise very similar in external appearance to the later Which may still he met with on existing installations but which will no longer be issuedįor new work are:- Telephone, Intercom, Nos. Of these telephones which may still he issued from Supplies Dept. 2) for multiple stations on the 2+10 system. 2) for multiple stations on the 1+5 system. telephones for use on the house exchange system are:. The paragraph dealing with the various items of equipment are as follows:. Installation of the system is described in C3023. The terms multiple station, 1+5 system, etc, are defined in C3001. This Instruction describes the various items of equipment used on the House Exchange
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