The field telephone is the basic and most frequently used piece of communication equipment on the battlefield. Used from the front line to the highest headquarters, it gave military commanders and unprecedented real time control of operations. Even though the design principles of field telephone equipment were well understood for many years, much of the equipment from before the1930’s was expensively produced on a small scale. The rapid developments in public phone network technology with which the field equipment was required to interface had led to a great complexity of equipment. The new field telephone unit, telephone switchboard and auxiliary equipment were introduced into service in 1933 and subsequent years would become the mainstay of German field communication. They would remain in production with only minor changes until the end of the war; of the FF 33 field telephone originally developed by Siemens in 1933, over 1.6 million examples were made by 24 different manufacturers.
Source :
"German Field Line Communication equipment of WW2" by Funksammler Publications
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