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Telephones Hand, No. 1
was used with Telephone Set F Mk I
, a Second World War era phone.
It is a molded hard plastic which houses a Receiver Inset, No. 1L and a Microphone Capsule, Mk IV and has a pressel switch incorporated.
Signal Training Volume III, Pamphlet No. 23, Telephone Sets F Mk I, 1939 - Plate 5