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B&Q Limited (short for Block & Quayle after the company's two founders) is a British multinational DIY, home improvement and garden centre retailing company, with headquarters in Eastleigh, England. It is a wholly owned subsidiary of Kingfisher plc .
In electronics and signal processing, a filter is usually a two-port circuit or device which removes frequency components of a signal (an alternating voltage or current). A band-pass filter allows through components in a specified band of frequencies, called its passband but blocks components with frequencies above or below this band.