Course and Speed Calculator
Air Ministry, Manufacturer; Hall Telephone Accessories (1928);
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Hall Telephone Accessories (1928)
COURSE & SPEED CALCULATOR / MK.IIA. / H.T.A.(1928) LTD / AM / 6B/125 Impressed
RAF (1928) COURSE & SPEED CALCULATOR WITH AIRSPEED SCALE / UP TO 310 MPH !! AND WINDSPEED / UP TO 70 MPH. PRESENTED BY / C.K. SILCOCK ESQ. Label
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