Mathematical Instruments
Mechanical Instruments for Drawing, Measuring and Integrating
Drafting Instruments
Rechenscheiben und Rechenwalzen
Planimeters and Integrators
Alfred J. Amsler & Co.
Gottlieb Coradi
Hünenberger-Murbach
Hünenberger
Polar Disc Planimeter
Rolling Disc Planimeter
Polar Planimeter
Murbach
Various Makers
K. Murbach