| http://www.w3.org/ns/prov#value | - It is within the scope and spirit of this invention to use a plane chart moved vertically by a suitable series of levers which are actuated by a simple iii-metallic element in lieu of the spiral elements shown. the accompanying drawings, in which: Fig. 1 is a front elevation taken in the direction of the arrow l of Fig. 2 with the cover casing broken away.
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