WWII Bell Telephone Laboratories Portable Information Center Master Index ES-800515

Original Bell Telephone Laboratories, Inc. Portable Information Center Master Index, publication ES-800515, housed in its original black binder.

The spine label identifies the binder as:

ES-800511-7 – Intercept Frequency Circuits, Wiring Diagrams, Cross-Connections & Maintenance Information

The master index describes a multi-folder portable communications system containing technical documentation for telephone facilities, terminal radio frames, PBX equipment, amplifiers, engine-alternator equipment, handsets, tools, spare parts and related maintenance material. The issue table on the title sheet is dated March–April 1942, placing the documentation in the early World War II period.

Bell Telephone Laboratories played a major role in wartime communications, radar and electronics development, adding historical interest to surviving technical documentation of this type. 

Item Details

• Organization: Bell Telephone Laboratories, Inc.
• Title: Portable Information Center—Master Index
• Publication number: ES-800515
• Related binder number: ES-800511-7
• Dates shown: March 9 and April 1, 1942
• Subject: Intercept-frequency circuits, wiring diagrams, cross-connections and maintenance information
• Format: Large technical-document binder
• Era: World War II
• Country: United States

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