MARTIN, Chief Justice.
The invention involved in this interference is a machine for forming one-piece sheet metal bull wheel rims, such as are used as pulleys for the heavy ropes employed in drilling wells, especially oil wells. The explanation is given that prior to the present invention such a rim was made in four sections by means of "bull dozers" which would stamp the grooves and flanges in each section while heated, after which the sections would be welded together...
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