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In page Fred Dibnah:

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His next major job was for local firm Hick Hargreaves, the proceeds of which enabled him to expand his collection of ladders to 30. He was commissioned to remove the top half of a 270-foot (82 m) chimney and employed an assistant, Percy Porter. The top of the chimney contained a length of railway line, which had been used for lifting materials during construction. Dibnah hacksawed the line into pieces, letting each piece fall to the ground, while his assistant below kept the area clear. He then spent the next six months removing each brick by hand while the chimney was still in use, as the factory could not afford to halt production.[5]