| http://www.w3.org/ns/prov#value | - The mechanical operation of the several elements shown in FIGS. 2 to 4 may be carried out by means described in my U.S. Pat. No. 3,029,468 and in numerous other patents, such as for example, U.S. Pat. No. 2,913,762, U.S. Pat. No. 2,298,716 and others.
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