Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 333
FiO. 302. … Kio. 303. The Duplex Sleam Pump. 335 The adoption of the WortJiiyigton design of duplex pumps,has been well nigh universal, especially so since the expirationof the earlier patents. Nearly all leading manufacturers nowTiiake duplex pumps. Single, compound and triple ex-^ansion. Compounding consists…
Hydraulic machinery · Pumping machinery
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