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CD-81719-01 4A And Appendices 1B 2D 3D 4D

Signaling Circuit 404 and 405, Dial tone generator for PBX "Touch-Tone" Calling.  Contributed by John Novack.

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Thanks for new documents from Chuck Hensley, John Gilbert, Chuck Batson, Alan David, Steve Flocke, Paul Wills, Dave Gruger, Jim Prather, John Stancliff, Sam Etler, John Novack, Clint Gilliland, Steve Cichorsky and Paul Fassbender.

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