Butler, Charles R. In Court of Appeals of District of Columbia, Oct. term, 1928, patent appeal no. 2231, in re Charles R. Butler, pistons; brief for commissioner of patents.
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Butler, Charles R. In Court of Appeals of District of Columbia, Oct. term, 1928, patent appeal no. 2231, in re Charles R. Butler, pistons; brief for commissioner of patents.
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Butler, Charles R. In Court of Appeals of District of Columbia, Oct. term, 1928, patent appeal no. 2231, in re Charles R. Butler, pistons; brief for commissioner of patents.