The Instruction Manual for the 4082-3 K&E Slide Rule

"THE LOG LOG DUPLEX DECITRIG SLIDE RULE WITH F SCALE"

"Adaptable for Radio Engineering Problems"

The front cover is torn and copyright information is not known. It is believed that this manual was printed around 1939. The 4082-3 is undocumented in available catalogs. This manual is the only known printed reference for this slide rule.