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International Business Machines Corporation
Date: circa 1944
Object number: 1997-1-0963e
Keuffel & Esser Company
Date: circa 1940
Object number: 2003-1-0204
Société Genevoise pour la Construction d'Instruments de Physique et de Mécanique
Date: circa 1900
Accessories: wooden case
Object number: 1997-1-0354f
Ernst Leitz (company)
Date: circa 1935
Accessories: eyepieces (2) G8x; other optical accessories, see 2003-1-0005b and 2003-1-0005c.
Object number: 2003-1-0005a
Keuffel & Esser Company
Date: patented 1900
Accessories: brown leather case, for storage
Object number: 2003-1-0225