Phillip C. Dretzka

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Minneapolis, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Modularized visual training aid for classroom instruction
- Patent number 5,501,603
- Issue date Mar 26, 1996
- Wenger Corporation
- Eric J. Mueller
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
Information Patent Grant
Modularized visual training aid for classroom instruction
- Patent number D361348
- Issue date Aug 15, 1995
- Wenger Corporation
- Eric J. Mueller
- D19 - Office supplies