Pickett N-1041-G Fisher valve sizing slide rule manual 1967 USA

This all metal slide rule was made by Pickett USA with designation N-1041-G for the American Company Fisher Controls. It was produced in the English language per the 1967 copyright. Also known as the Universal valve sizing rule. Most Pickett rules come in yellow or white but this one is green! It also has the original manual in English. It is double sided with sturdy plastic cursor and comes in the original unsigned sleeve (but I assume original). Everything is in great condition with minimal signs of use and age. It measures ca. 31 cm or 12 1/4 inches. Do check the video below on how to work your vintage man tool : slide rule operation instructions!