UNA-F-31- USSR field telephone with phonetic signaling, model
1931. Housed in a wooden cabinet, using 3 VDC internal
battery. WHD = 285 х 240 х 100 mm,
weight with battery 4.7 kg.
UNA-F-31
and UNA-I-31 of 1931 have been basic field telephones of the
Red Army till 1942 when more sophisticated UNA-F-42,
UNA-F-42-M and UNA-I-42 models came into production.
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