Willem Coenraad Bergwerf

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Drachten, NL

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for opening an envelope
- Patent number 5,983,609
- Issue date Nov 16, 1999
- Hadewe B.V.
- Jeichienus Adriaan van der Werff
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
Information Patent Grant
Method and apparatus for filling and closing envelopes
- Patent number 5,899,050
- Issue date May 4, 1999
- Hadewe B.V.
- Willem Coenraad Bergwerf
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES