1797 3 464 The piston-plunger is worked by a toothed segment-wheel.
1894 Nov. 256/2 Piston-plungers are sure to leak badly, requiring frequent re-packing.
2003 (Nexis) 7 Oct. 5 Taylor & Fonseca has taken a slightly different route by installing piston plungers in their fermentation vats.