Otis King's Pocket Calculator

A7942

Upper Scale (423)
Crown:
"MADE IN ENGLAND"
Top:
"PATENT No. 183723"
Bottom:
"COPYRIGHT. SCALE No. 423" "OTIS KING'S POCKET CALCULATOR"
Lower Scale (414)
Top:
"PATENTEES * SOLE MANUFACTURERS; CARBIC LIMITED, 51 HOLBORN VIADUCT, LONDON E.C.1"
Bottom:
"OTIS KING'S PATENT No. 183723"

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