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2. Field telephone - Wikipedia

   en.wikipedia.org/wiki/Field_telephone

   Field telephones are telephones used for military communications. They can draw power from their own battery, from a telephone exchange (via a central battery known as CB), or from an external power source. Some need no battery, being sound-powered telephones . Telephone linesmen ford Lunga River during the Guadalcanal Campaign of World War II.

3. TA-57 - Wikipedia

   en.wikipedia.org/wiki/TA-57

   The TA-57 can be used for induction calls working with 2-wire lines in an OB (local battery) or a ZB (central battery) operation. It can be used to transmit voice messaging in ranges between 0.3 and 3.4 kHz, with a calling frequency of 15 to 45 Hz. Absolute signal level at output of transmission path with a 600Ω load ranges between -3 and +3 dBu.

4. Military communications - Wikipedia

   en.wikipedia.org/wiki/Military_communications

   Military communications – or "comms" – are activities, equipment, techniques, and tactics used by the military in some of the most hostile areas of the earth and in challenging environments such as battlefields, on land (compare radio in a box ), underwater and also in air. Military comms include command, control and communications and ...

5. Wireless Communications of the German Army in World War II

   en.wikipedia.org/wiki/Wireless_Communications_of...

   The German-army-issued infantry radios in two main series. The "Backpack" or Torn series and the field or Feld series. Torn.Fu Series. Torn.Fu.a: A HF transceiver. It operated in the 3–6.67 MHz frequency range. 2 Watt output AM voice and CW Torn.Fu.b: A HF transceiver. It operated in the 3-5 MHz frequency range. 0.7 Watt output AM voice and CW.

6. Tucker Telephone - Wikipedia

   en.wikipedia.org/wiki/Tucker_telephone

   Tucker Telephone. The Tucker Telephone is a torture device designed using parts from an old-fashioned crank telephone. The electric generator of the telephone is wired in sequence to two dry cell batteries so that the instrument can be used to administer electric shocks to another person.

7. United States Army Signal Corps - Wikipedia

   en.wikipedia.org/wiki/United_States_Army_Signal...

   The United States Army Signal Corps ( USASC) is a branch of the United States Army that creates and manages communications and information systems for the command and control of combined arms forces. It was established in 1860, the brainchild of Major Albert J. Myer, and had an important role in the American Civil War.