Combination core definition

Combination core means a platform for making hardwood plywood that consists of a combination of layers of veneer and particleboard or medium density fiberboard.
Combination core means a core material for making hardwood plywood that consists of a combination of layers of veneer and particleboard, medium density fiberboard, or other materials.‌
Combination core means a core material for making hardwood plywood that consists of a combination of layers of veneer and composite wood.