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Public Switched Telephone Network retrofit (six-digit phone numers), Basle 1953
UMG26A18_450

Public Switched Telephone Network retrofit (six-di...

Public Switched Telephone Network retrofit (six-digit phone numers), Basle 1953
UMG26A18_482

Public Switched Telephone Network retrofit (six-di...

Public Switched Telephone Network retrofit (six-digit phone numers), Basle 1953
UMG26A18_484

Public Switched Telephone Network retrofit (six-di...

Public Switched Telephone Network retrofit (six-digit phone numers), Basle 1953
UMG26A18_483

Public Switched Telephone Network retrofit (six-di...

The New IBM 650 Computer
UMG23A34_192

The New IBM 650 Computer

Direct-Dial Telex System
UMG22A53_255

Direct-Dial Telex System

The Skeleton's Hands
UMG20B31_089

The Skeleton's Hands