Bell Telephone Laboratories Transmission Transformers Engineering Reference 1964

Bell Telephone Laboratories Power Apparatus Engineering Reference Data 1958 Book

Bell Telephone Laboratories Numerically-Coded Keys Engineering Reference 1964

Bell Telephone System Technical Publication Computers 1953 Booklet History

Bell Telephone Laboratories Resistors Engineering Reference Data 1966 booket

Bell Telephone Laboratories Sealed Contact Relays Engineering Reference Data '64

Bell Telephone Laboratories Hermetically Sealed Terminals Reference 1961 Booket

1964 IBM 24 Card Punch Student Field Engineering Reference Manual