SIEMENS BROTHERS No. PTD 509
"SILENT CALL" TELEPHONES

P.T.D. 509

 Table and Wall type telephones of the latest patterns, as No. 356A/A and 367A/A respectively, but fitted with Perspex covered Lamp Signalling Unit.


Take from the SIEMENS BROTHERS & CO. LIMITED catalogue No.500/54 

 
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Last revised: October 08, 2025

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