Dates of Availability

Dates of availability are estimates only.  Many models did not appear in the Hemmi catalog until several years after they were "announced;" in such cases I have used the date of first catalog appearance unless I know of a specimen with an earlier date code.  Ending dates are the date of last appearance in the Hemmi catalog unless I know of a specimen with a later date.  "MIOJ" means "Made in Occupied Japan" = 1946-51.

For a guide to estimating dates of manufacture of Hemmi slide rules click here.