Betram L. Koslin

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Yorktown Heights, NY, US

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Patents Grantslast 30 patents

Information Patent Grant
Test answer and score sheet device
- Patent number 4,943,239
- Issue date Jul 24, 1990
- Touchstone Applied Science Associates, Inc.
- Betram L. Koslin
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS