Safety appliances approved by the Industrial Board :
boiler appliances /
Commonwealth of Pennsylvania, Department of Labor and Industry.
|Related Names:||Connelly, Clifford B.|
[Harrisburg, Pa. : The Board, 1920?]
Manufactures / United States /
Labor > Labor / Accidents > Labor / Accidents / Prevention.
Boilers > Boilers / Equipment.
At head of title: Commonwealth of Pennsylvania, Dept. of Labor and Industry, Clifford B. Connelly, Commissioner.
33 p. :
ill., plates ;
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