pdf C31.101 I3 Subscriber Sets - Description Popular

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C31.101_I3_Jul53_SubscriberSets_Description.pdf

C31.101 I3 Subscriber Sets - Description
July 53. Includes 433, 633, 653 sets, 434, 634 and 648 type bell boxes and 531 and 592 extension ringers.  Addendum Issue 1 adds info on B-type ringers.

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