U.S. Army Signal Corps Manual Set – TM 11-2114 & TM 11-2115 (1949–1950)

Stepping Switch Test Set + Crash & Conference Equipment – Central Office Systems

Offered here is a matched pair of original U.S. Army Technical Manuals covering early military telephone switching systems. These manuals document the operation, testing, and control of step-by-step (Strowger-type) central office equipment, which formed the backbone of WWII and early Cold War communications networks.

This is a complete, complementary set, with one manual focused on testing and maintenance, and the other on operational control features such as conference calling and priority override (“crash”) systems.

Included Manuals:

TM 11-2114 (June 1949)

Stepping-Switch Test Set – Step-by-Step Dial Central Office Equipment

• Covers testing, calibration, and troubleshooting
• Includes detailed wiring diagrams and procedures

TM 11-2115 (March 1950)

Crash and Conference Equipment – Step-by-Step Dial Central Office Equipment

• Covers multi-line conference systems
• Includes priority override (“crash”) circuit operation
• Focuses on operator control and switching functions

Historical Significance:

These manuals represent the core of U.S. Army Signal Corps communications infrastructure in the immediate post-WWII era. Systems like these were used in:

• Military bases and command centers
• Early telephone exchanges
• Air defense and operations coordination environments

 This set is well suited for collectors of military communications, Signal Corps equipment, and early telecommunications history.

Condition:

• Both manuals are complete and intact
• Light age-related wear and toning to covers
• Clean, readable interiors
• No major damage observed

Collector Appeal:

• Original government-issued manuals
• Matching system coverage (test and operation)
• Ideal for display or pairing with vintage communications equipment
• Strong foundation for a larger central office documentation set

Open to reasonable offers