FIELD: wood- working industry. SUBSTANCE: drilling-out of flaws in the timber and manufacturing of plugs are accompanied by formation of projections and recesses on side surfaces of the socket and the plug which are arranged in the side surfaces of annual rings of the timber. The plugs are manufactured with their fibres oriented lengthwise. EFFECT: higher labour productivity. 4 dwg
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Authors
Dates
1994-01-15—Published
1990-10-04—Filed