pdf SD-69567-01 Dial Selective Intercom Line Circuit Popular
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SD_69567_01_DialSelectiveIntercomLineCt.pdf
Dial-selective intercom KTU's used in 1A2 systems, primarily with the 640-series modular panels and 7A thru 27A Com Key (ComKey) systems (not the 416 series). It includes details on the 407B and C, 420A, 422A and B, 423A, 424A, B and C, 425A and B, 444A, 491A and 494A and B KTU's. Contributed by Bruce Lane.
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