Mathematical Instruments
Mechanical Instruments for Drawing, Measuring and Integrating
Drafting Instruments
Hommel-Esser Aarau
Kern & Co. Aarau
Gysi & Co. Aarau
J. Bossart Suhr-Aarau
G. Coradi Zürich
Coordinatographs
Coordinatograph
Detail Coordinatograph
Haag-Streit
Various Makers
Planimeters and Integrators