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Telescopic cylinder - Wikipedia
Amazon.com: Maxim 7 Ton Single Acting Telescopic Cylinder: 3.74 OD x 108 Stroke - 2" Rod Diameter, 3000 Max PSI, 3” Sections, Retracted Length: 45.5 and 1/2" NPT Port Size with 1" Pin Dia, 210702 : Industrial & Scientific