| 摘要 |
Expansion cylinder of elastically variable length at a cross-section essentially invariable in its dimensions, as a result of which an expansion cylinder (1) is combined with one or more further expansion cylinders (1, 2) or movable separating members (36, 37, 38) to form a functional unit and/or the expansion cylinder or some or all the expansion cylinders of the functional unit have devices or arrangements allocated to them through which two- or three-dimensional movements of the free expansion-cylinder ends can be performed during the expansion action. <IMAGE>
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