ACBL Bridge Beat #99: Duplicate Boards
The first duplicate boards (then called trays) were devised by Cassius M. Paine and J. L. Sebring in 1891. They were square boards, called Kalamazoo after the company that manufactured them. The first oblong boards were produced by William McKenney in 1928 using paper, and the first metal boards were manufactured in 1931 by F.
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