THE SLIDE RULE TRADING CO. Paul Ross




The Slide Rule Trading Company has gone out of business effective June 30, 2023.

The Hemmi Catalogue Raisonne  (Description of every numbered-model slide rule made by Hemmi Slide Rule Company of Tokyo) has moved to Mike Konshak's International Slide Rule museum.  Click here to go there.

Hemmi Catalogue II  (Description of every Hemmi slide rule that did not have a model number) has also moved to the International Slide Rule Museum.  Click here to go there.

And, finally, the POST Slide Rule Cross Reference (Frederick -Post-labelled slide rules from 1903 on).  Has also moved to the ISRM.  Click here.