B.V. Grint - en Zandexploitatie Maatschappij v/h Gebrs. Smals

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Installation for extracting granular material in a predetermined co...
- Patent number 5,076,702
- Issue date Dec 31, 1991
- B.V. Grint - en Zandexploitatie Maatschappij v/h Gebrs. Smals
- Michael R. Smals
- B28 - WORKING CEMENT, CLAY, OR STONE

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