Pickett C19-T Collins microwave error version 1965 USA

High on of the largest and very interesting dedicated slide rules by Pickett. It is the C19-T Microwave Transmission slide rule. It is the shortly made error version (missing the minuses on the lower scale in front of the 90 and 85 (left side) as described in the article. For a high quality slide rules like this to be misprinted must have been a unique situation (and a marketing horror). Specially since this slide rules was produced for and with the knowledge of the Collins Radio Company. Made around 1965. It comes with the original outer box, the standard scale booklet, a beautiful leather sleeve but it is missing the white insert sheets/manual. The C18/C19 instruction sheet scans made by fellow enthusiasts can be found here and here. The C19 T stamped box is complete but has clear signs of storage and small tears. The booklet has a bad back page, the slide rule and sleeve are in very good condition. This slide rule measures about 31 cm or 12 1/4 inches long.

Check the attached video on how to work your vintage man tool : slide rule operation instructions!