5 ms·
The rack unit's dimensions are inherited from manual telephone switchboard jack-and-lamp panels ... and the standard rack is approximately 100 years old. https
by chronomex 5y ago
The rack unit's dimensions are inherited from manual telephone switchboard jack-and-lamp panels ... and the standard rack is approximately 100 years old. https://archive.org/details/bstj2-3-112 https://archive.org/details/bstj2-3-112