Derrick hoist

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Alternative terms(ssecond) : Cargo purchase, main purchase (USAUnited States of America)

The main arrangement of blocks and ropes for hoisting and lowering weights, such as buoys, sinkers, etc.

Please note that this is the term as it stands in the original IALAInternational Association of Marine Aids to Navigation and Lighthouse Authorities - AISM Dictionary edition (1970-1989)