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1966 Bell Telephone Laboratories M Lepselter Beam Lead Technology Transistor Ad

1966 Bell Telephone - $9.99

1966 Bell Telephone Laboratories M Lepselter Beam Lead Technology Transistor Ad

1966 Bell Telephone Laboratories Microscopy Electron Beam Microscope Print Ad

1966 Bell Telephone - $9.99

1966 Bell Telephone Laboratories Microscopy Electron Beam Microscope Print Ad