CHM Revolution

Date

1955

Credit Line

Courtesy of Clark McCoy

Copyright Owner

© Keuffel & Esser Co.

Keywords

Slide rule; Keuffel & Esser Co.

Object ID

500004492

Keuffel & Esser produced drafting supplies and mathematical instruments. Best known for their slide rules, K&E also made planimeters. But the firm didn’t survive the transition to electronics. After 120 years, it closed in 1987.