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George John Pfahl
William Porter Maynard
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8792. Pfahl, G. J., and Maynard, W. P. May 12. Blocks for columns. Woo a or other blocks 5<a>, 5<b> are formed with grooved interlocking edges, and are connected by internal tie-blocks 13, formed with dovetail tongues which enter dovetail grooves in the blocks 5<a>, 5<b>.
GB190008792D1900-05-121900-05-12Improvements in Columns.
ExpiredGB190008792A
(en)