Mathematical Instruments
Mechanical Instruments for Drawing, Measuring and Integrating
Drafting Instruments
Hommel-Esser Aarau
Kern & Co. Aarau
Jakob Kern
Kern & Cie.
Drafting Set
Lithographic Draftiong Set
Tubular Compass
Pocket Compass
Planimeter (Alfred J. Amsler & Co.)
Dotting Pen
Road Pen
Proportional Divider
Kern Aarau
Kern Swiss
Gysi & Co. Aarau
J. Bossart Suhr-Aarau
Various Makers
Rechenscheiben und Rechenwalzen
