Membership
Tour
Register
Log in
Jan Alkema
Follow
Person
Pijnacker, NL
People
Overview
Industries
Organizations
People
Information
Impact
Patents Grants
last 30 patents
Information
Patent Grant
Hopper vessel with discharge valve members adapted to selectively f...
Patent number
4,176,885
Issue date
Dec 4, 1979
Koninklijke Adriaan Volker Baggermaatschappij B.V.
Jan Alkema
B63 - SHIPS OR OTHER WATERBORNE VESSELS RELATED EQUIPMENT