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Johan H. Volbeda
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Rijswijk, NL
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last 30 patents
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Patent Grant
Rotary cutter head with jet flushing blades
Patent number
4,327,507
Issue date
May 4, 1982
Hollandsche Aanneming Maatschappij B.V.
Johan H. Volbeda
E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Patent Grant
Tooth positioning arrangement for an underwater soil cutting head
Patent number
4,135,318
Issue date
Jan 23, 1979
Hollandsche Aanneming Maatschappij B.V.
Johan H. Volbeda
E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING