Hollow flooring block
Hollow concrete or earthenware block used as a component in lightweight concrete floor construction.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Hollow concrete or earthenware block used as a component in lightweight concrete floor construction.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM