THE NEW SILENT PNEUMATIC DRILL being demonstrated in the streets of London recently. It is claimed that the machine is inaudible above the noise of the traffic, and can drive through concrete at twice the speed of the n oisy drills at present in use.
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Northern Advocate, 31 July 1939, Page 10
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45THE NEW SILENT PNEUMATIC DRILL being demonstrated in the streets of London recently. It is claimed that the machine is inaudible above the noise of the traffic, and can drive through concrete at twice the speed of the n oisy drills at present in use. Northern Advocate, 31 July 1939, Page 10
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