细节
An electrically-operated 12cm. Distant Signal,
Cat. Ref. 13954, with shifting colour light, circa 1939, a hand-operated Electric Colour Light Signal, Cat. Ref. 1346 and 17cm. Electric Distant Signal (G-E) (3)
Cat. Ref. 13954, with shifting colour light, circa 1939, a hand-operated Electric Colour Light Signal, Cat. Ref. 1346 and 17cm. Electric Distant Signal (G-E) (3)