Owner's Manual with schematic diagram. The Realistic DUoFONE Electronic Telephone Amplifier System provides "hands-free" telephone conversations at home or office. Radio Shack Catalog 43-278.

Contributed by Kurt Rudolph. OCR and bookmarks by Paul Fassbender.

54 pages. National Cash Register. Instructions for the care and maintenance of these systems. Includes the equipment, stamping and perforating phone and switchboard.

Contributed by Paul Fassbender.

48 pages. Undated. Illustrated Catalogue E - Telephones - Switchboards - Accessories. Scanned and Contributed by Steve Cichorsky from a document provided by Steve Hilsz.

60 pages. Installation and Operation. Contributed by Hubert Miller. Scanning and OCR by John Novack.

WITH CALL WAITING DELUXE AND VOICE MAIL FUNCTIONS 99 NUMBER-ONLY MEMORY OR 67 NAME/NUMBER MEMORY. Contributed by Naveen Albert. OCR and processing by Paul Fassbender.

Single slot. Description, Installation, and Programming Manual. Contributed by John Novack.

Contributed and scanned by John Novack. Processed by Paul Fassbender.

Contributed and scanned by John Novack. Processed by Paul Fassbender.

Contributed and scanned by John Novack. Processed by Paul Fassbender.

Dietrich Arbenz identified the housing used for the desk set as coming from the Siemens & Halske Fgtist 282. Its colors indicate that is an early model from the second half of the 1950s. Both were apparently unmodified by RCA. The wall set's housing is from a Fgstat 23, from the same period. Contributed and scanned by John Novack. Processed by Paul Fassbender.

Contributed and scanned by John Novack. Processed by Paul Fassbender.

Includes TOOLS for LINE CONSTRUCTION and MAINTENANCE. Contributed by John Novack. Processed by Paul Fassbender.

52 pages. 8MB. Includes systems with Western Electric and Stromberg Carlson components and sets. Contributed by John Novack. Bookmarked and processed by Paul Fassbender.

Contributed by John Novack. Bookmarked and processed by Paul Fassbender.

Manual in Russian. Watch for a translation. (OCRed, so you can try your own on-line translation.) "Telephone Set for Local Connections" (TKMS) is a six-point telephone switchboard serving communication between managers and services in rural or inside small manufacturing enterprises and institutions. Power supply is obtained from the AC (127-220 volts).

The TKMS is designed to work in indoor conditions.

The term that the manual uses for the "apparatus box" is simply "power supply unit" (блок питания), and that is indeed what the diagram shows in the boxed part in the upper right. The power supply provides rectified power for the bell, talk battery, and AC signaling current for lamps.

The lower left is the telephone operator circuit, very similar to that of the KD6/KS6, with just a small resistor rearrangement. However, the circuit is used for local intercom operation with talk DC provided by the power supply.

Contributed by Jeremy Walters. Comments by Karl Brose. OCRed & Processed by Paul Fassbender.

Manual in Russian. Watch for a translation. (OCRed, so you can try your own on-line translation.) This telephone set has type number КД-6 (KD-6 in English), and was made by Krasnaya Zarya, one of the few telephone manufacturers in the Soviet Union, and Russia previously.

The KD-6 was a 6-line "concentrator" telephone set intended for senior managers of the central banking system, or perhaps other large organizations. The manual explicitly refers to the banking system.  A similar companion set, the КС-6 (KS-6 in English) was for use of the manager's secretary. Contributed by Harry Smith and Karl Brose. Processed by Paul Fassbender.

Contributed by Steve Cichorsky.

Contributed by Steve Cichorsky. OCR by Remco Enthoven. Processed by Paul Fassbender.