pdf 529-205-100 and 529-205-400 500AB & 500ABM 2- or 4-wire sets Popular
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529_205_100_I2_Jun76_500AB_500ABM_ID_529_205_400_May76_Connections.pdf
529-205-100, Issue 2, June 76 - 500AB and 500ABM ID, Installation & Maintenance.
529-205-400, Issue 2, May 76 - 500AB and 500ABM Connections
500AB & ABM can be used with the 3A speakerphone system in 2-wire service (only). Replaced 502-510-411. The sets are listed for use solely with specially engineered lines -- not for general telephone use. BSPs are marked for limited distribution. Scan provided by Dave Gruger.
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