Mathematical Instruments
Mechanical Instruments for Drawing, Measuring and Integrating
Drafting Instruments
Ludwig Esser
Hommel-Esser Aarau
History
Serial Numbers and Markings
Catalogs and Price Lists
Various Documents
Kern & Co. Aarau
Gysi & Co. Aarau
J. Bossart Suhr-Aarau
F. Rohr-Bircher
Glaus, Leuzinger & Cie.
Wild Heerbrugg
Calculating Discs and Drums
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