This green plastic slide rule was made by IWA Germany with number 05136 for the American Company Fisher Controls. It was produced per the 1972 copyright model Mark VI-E. The white one is an earlier model Mark III made in England per copyright 1963, probably by Blundell. Both are double sided with all plastic cursor and with their original leather cases. They share a manual in English. Everything is complete and in good condition with some signs of use and age (most to the manual). They measures ca. 27,5 cm or 11 inches long. Do check the video below on how to work your vintage man tool : slide rule operation instructions!
2x IWA 05136 Fisher control valve sizing slide rule 1970 USA
€50.00
2x IWA 05136 and Blundell Fisher control valve sizing slide rules 1963 and 1972 USA/Germany/England
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