FIELD: civil engineering. SUBSTANCE: nonremovable shutter includes shutter boards, anchor members, hinges. Shutter boards are butted to each other on both sides of shutter. Anchor members are used to secure opposite shutter boards. Hinges are made of soft reinforcing-bar steel. Anchor members are made in the form of metal bracket with bent aside sections. Each bent aside section is bent as sinusoid. EFFECT: higher productivity. 9 dwg
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Authors
Dates
1997-06-10—Published
1993-05-25—Filed