| http://www.w3.org/ns/prov#value | - The compression spring 12 functions as an adjusting spring.Though the free end of the compression spring 12 can always abut against the step portion 8, it is preferable, as shown in FIG. 1, that the length of the compression spring 12 is so short that the end of the compression spring 12 temporarilyabuts against the step portion 8 only when an adjusting force is required, i.e. the wire 9, the rack
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