National Radio Tubes Slide Rule
Manufactured by K&E
This slide rule was produced as a special by K&E. It was constructed on the frame of a N4058W. It probably dates in the early 1950s. The case of a cardboard box with leatherette covering similar to other K&E rules. The Case is marked "NATIONAL UNION RADIO SLIDE RULE"
Specimen #1 - From the collection of Michael O'Leary
Specimen #2 - From the collection of Clark McCoy