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According to the book, Early Shotgun Concentrators and Spreaders by Gary B. Muckel, 6531 Carlsbad Dr., Lincoln, NE 68510, $55 plus $3 shipping, the UMC shot concentrators were of the Lancaster design. See U.S. Patent No. 97,653 granted Dec. 7, 1869.
Century earlier attempts to do what the Winchester/Western Mark 5 and modern plastic wads have done.