Devices Development Corporation

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St. Louis, MO, US

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Patents Grantslast 30 patents

Information Patent Grant
Electronically controlled safety mechanism for highway exit ramp
- Patent number 4,320,380
- Issue date Mar 16, 1982
- Devices Development Corporation
- Louis N. Berard
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Safety mechanism for highway exit ramp
- Patent number 4,133,140
- Issue date Jan 9, 1979
- Devices Development Corporation
- Louis N. Berard
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES