This paper reviews some typical Japanese reef modules which belong to the exhibitors at the 3rd International Artificial Reef Conference, Newport Beach, California, 3–5 November 1983. These exhibitors consisted of six members of the Large Reef Association (Ohgata Gyosho Kyokai),
all manufacturers of concrete reef modules, and eight members of the Steel Products Association (Kozai Club), all manufacturers of steel reef modules.
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