Robert Arthur Henderson Heard

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Backwell, Bristol, EN

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Patents Grantslast 30 patents

Information Patent Grant
Securing device
- Patent number 4,094,487
- Issue date Jun 13, 1978
- Robert Arthur Henderson Heard
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Securing device
- Patent number 4,066,233
- Issue date Jan 3, 1978
- Robert Arthur Henderson Heard
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS