Colnect-3012-905-Digital-telephone--amp--circuit-diagram.jpg
Source: Colnect
  • Colnect-5049-243-Digital-telephone--amp--circuit-diagram.jpg
Issued by: Singapore
Function: postage
Date: 10/5/1979
Issue: 100th Anniversary of the Telephone
Denom: 75c
Color: light green & orange
Design: Digital telephone circuit diagram
Watermark: unwmk
Perf: 13.5x13.25
Catalog value:



External links:
Colnect 582027.._the_Telephone


Record of changes