Northern Telecom / BNR
PDF Patent Files For 1980’s Telephone Bell Chime Enclosure.
01 January 19th 1980 Telephone Bell Chime Enclosure Patent.pdf
02 October3rd 1984 Telephone Bell Chime Enclosure Patent.pdf
Telephone Bell Chime Enclosure Patent
Northern Telecom / BNR
PDF Patent Files For 1980’s Telephone Bell Chime Enclosure.
01 January 19th 1980 Telephone Bell Chime Enclosure Patent.pdf
02 October3rd 1984 Telephone Bell Chime Enclosure Patent.pdf