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The name of this association presumably refers to the Manchester Association for the Prevention of Steam Boiler Explosions; also see Manchester Steam Users Association
1869 Lavington Fletcher was chief engineer of the Manchester Association for the Prevention of Boiler Explosions.
1921 Letter to The Times, about the airship R.38's accident, mentioned the Manchester Steam Users' Association for Prevention of Boiler Explosions which had designed the 1882 Boiler Explosion Act as an example of assembling data rather than taking measures in panic after a catasphore.