Ian Harold Day

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London, EN

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Patents Grantslast 30 patents

Information Patent Grant
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- Patent number 3,992,559
- Issue date Nov 16, 1976
- Polymark Limited
- Ian Day
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
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- Patent number 3,959,555
- Issue date May 25, 1976
- Polymark Corporation
- Ian Harold Day
- B44 - DECORATIVE ARTS