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A system of counterbraces.

A brace which counteracts the strain of another brace, as a web member of a truss.

To enlarge a hole to receive the head of a bolt or a nut.

A double-hung window constructed so that the weights of the upper and lower sashes balance each other.

A rivet used in countersunk holes in which the point, while hot, is hammered down to fill the countersinking.