NATIONAL TELEPHONE COMPANY
B575

BATTERY INTERCOMMUNICATION TELEPHONES

SECRET SERVICE

TABLE SET

Pattern No. B575

Comprises the same parts as Pattern No. B570, with the addition of a Wall Rosette and Cord.

Produced in 5, 10 & 15 line models.

These are cheaper forms of the Secret Service Instruments, Patterns Nos. B560 and B565, but are in every way reliable and efficient and comprise all the advantages of the more expensive instruments.


 
 
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Last revised: November 17, 2025

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