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David M. Warren
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Woodmere, NY, US
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last 30 patents
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Patent Grant
System for the printing and reading of encrypted messages
Patent number
4,829,568
Issue date
May 9, 1989
Pitney-Bowes
John I. Clark
G06 - COMPUTING CALCULATING COUNTING
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Patent Grant
System for the printing and reading of encrypted messages
Patent number
4,641,346
Issue date
Feb 3, 1987
Pitney Bowes Inc.
John I. Clark
G06 - COMPUTING CALCULATING COUNTING