Lid for the slide rule case

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Lid for the case of the slide rule.

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ID:	NAV0195.2
Type:	Lid for the slide rule case
Display location:	Not on display
Creator:	Unknown
Date made:	circa 1939
Credit:	National Maritime Museum, Greenwich, London
Measurements:	Diameter: 72 mm;Overall: 72 mm
Parts:	Metal position slide rule (Slide rule) Base of case for slide rule (NAV0195.1) Lid for the slide rule case (NAV0195.2) Instructions for the slide rule (NAV0195.3)