Welch, Nicholas A. "Welch Key Card Switch and System" Patent US3403380 A 24 September 1968. - kg-v1 - modemuze - Netwerk Digitaal Erfgoed

Welch, Nicholas A. "Welch Key Card Switch and System" Patent US3403380 A 24 September 1968.

Welch, Nicholas A. "Welch Key Card Switch and System" Patent US3403380 A 24 September 1968.

http://vocab.getty.edu/aat/source/2000079598

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Welch, Nicholas A. "Welch Key Card Switch and System" Patent US3403380 A 24 September 1968.

http://vocab.getty.edu/aat/source/2000079598

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2000079598

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2014-05-19T16:28:22

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title

Welch, Nicholas A. "Welch Key ...... S3403380 A 24 September 1968.

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Welch, Welch Key Card Switch and System, Patent US3403380 A (1968)

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