or any other combination which is substanti ally the same thing and by which analogous results are produced. To J. Johnson of Genese N. Y. for improved method of working the pall in parallel vices. What I claim is the within described combi nation of the spring pawl and the metalic plate (or lever) with the foot of one of the crossed levers by which the spring pawl is made to actupun and retain the rack bar when MB @ 1850 SCIENTIFIC AMERICAN INC, 1850-04-20
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