Title
Vacuum tube type 2D21Catalog Number
102729906Type
Physical objectDescription
This record contains 7 vacuum tubes type 2D21, each with seven connector pins. "IBM" and "MADE IN U.S.A. are printed on each tube.Date
1954 ca.Manufacturer
International Business Machines (IBM)Place Manufactured
U.S.Identifying Numbers
Part number | 2D21 | Printed on each tube, near the top |