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MUD SUCTION WAGON
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Hose reel for tanker or construction vehicle - has vertical pivot shaft for fork arranged at free end of pivot arm which can swing through right angle to position at side of vehicle
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Safety valve for pressure vessel - has deformable ring with hammer head bolts releasable only when vacuum is present in vessel
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Road sign washing machine - has pressure-relief valve-controlled piston and cylinder to swivel mast and maximise brush pressure
