PRESS BUTTON UNIT No. 55
This a press button unit that consists of a 12 button keypad marked 1 to 0, T and P.

The keypad is LD (dial pulse) only.

This keypad has the ability to store 10, 18 digit numbers.

Used on the Telephone No. 772.

ModelMarkGreyIvoryPBU NoIntroduced Remarks
Tele 772Mk 1yy55A/31/80 PYE/TMC Originally 1/772
 Mk 2yy55A/2 1/80 GEC Originally 2/772
Tele 772KMk 1yy55B/33/80 TMC fitted with subs dial lock
Tele 1/772Mk 1yy 55A/311/76 PYE/TMC
Tele 2/772Mk 1 y 55A/210/78 GEC
Tele 8772Mk 1yy55A/3 4/82 PYE/TMC
Tele 8772Mk 2yy55A/2 4/82 GEC

 

 
 
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Last revised: September 26, 2024

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