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细节
A late 18th-Century five-draw 2in. telescope by Ramsden
in brass with mahogany outer body tube, signed by the eye-piece with dust slide Ramsden London, extended length -- 41in. (105.5cm.) See illustration
in brass with mahogany outer body tube, signed by the eye-piece with dust slide Ramsden London, extended length -- 41in. (105.5cm.) See illustration