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booster pump

An auxiliary pump which is used in a piping system to increase or maintain the pressure in the system.

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bored lock

A lock intended for installation in a circular hole in a door.

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blunt arch

An arch rising to a slight point, struck from two centers within the arch.

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bit

1. A small tool which fits in the chuck of a brace or drill, and by which it is rotated  thereby

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bituminized fiber pipe

A lightweight drainage pipe fabricated of cellulose fiber combined with coal tar.

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blind arcade

A decorative row of arches applied to a wall as a decorative element, esp. in Romanesque buildings.

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