Kaiser Aluminum Slide Chart Circuit Calculators - Republic Steel Corp Estimator

Description

Do You Need A Circuit Calculator?
Vintage lot of 3 circuit and freight rate calculators/estimators in the "slide-chart" style. I'm not familiar with these pieces but someone in this field might appreciate them.
Lot Includes:
Kaiser Aluminum & Chemical Sales - Circuit Calculator (Slide Chart) / Year: Unknown / 8.25" long x 3.5" tall / KW-813
Republic Steel Corp., Cleveland, OH - Rigid Steel Conduit Freight Rate Estimator (Slide Chart) / Year: 1959 / 9.25" long x 4" tall / AC-1-1199
Kaiser Aluminum Electrical Products - Aluminum Circuit Calculator (Slide Chart) / Year: Unknown / 9" long x 4" tall / EP-314
All are in fair to good pre-owned vintage condition. All show surface wear.  All have sliding insert. Purchased at local estate sale. Sold as is. View photos before purchasing.
I try to describe defects as accurately as possible. Items have been stored in a smoke and pet free environment.
A great item for the vintage slide-chart calculators.
Visit The Parkwater Princess as we share our favorite vintage items for the guys.