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SD-65680-01 i13 - 507 PBX Schematics Bc

Issue 13.  507A (3-CO trunk, 7-station) & 507B (5-CO trunk, 12-station) Cordless Common Battery PBXs

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Thanks for new documents from Shane Young, David Brown, the Connections Museum, Paul Fassbender, Lou Maffei, Rick Thoensen. Sheila Flory, Tom Hesson, Jim Hurtle, Ed Palazzo, Bruce Patterson, Remco Enthoven, Jon Kolger, Paul Ivester, Len Hicken, Fred Haynes, Kurt Rudolph, Wade ("Kellogg KITT"), Rick Walsh, and Jeff Lamb.

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