Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 30
Swing Check Valnt:. Switch (ock. Sluing check valve. One which swings upon a pivot or hinge inopening and closing. Switch cock or valve. A device for conducting exhaust steaminto the smoke stack or atmosphere. A three-way cock.
Hydraulic machinery · Pumping machinery
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
