| 摘要 |
PROBLEM TO BE SOLVED: To provide a combinational block easy to handle by constituting the block so as to be connectable both in longitudinally and transversely horizontal directions and vertical directions vertically bent 90 deg. with firmness, stability and preciseness, and allowing the attachment and detachment thereof with a light force. SOLUTION: Teeth having equal height and depth are arranged around a square plate part in a form meshable with the opposite side. Strip-like protruding parts 3 and lattice-like grooves 4 are arranged on the side surfaces of the teeth, or only the lattice-like grooves 4 are arranged thereon without arranging the protruding part 3.
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