Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 216
Fig. 193. Pump Parts. 217 composition metal forms a hub around the center throughwhich the bolt or stud passes to guide the valve and to preventexcessive wear of the hole. Its wire coil frame work clothedwith rubber maintains a due amountof stiffness, with a degree of flexibility
Hydraulic machinery · Pumping machinery
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