US Patent No. 921,698, granted May 18, 1909 to Charles Hickton of Long Eaton, England, for an improvement to twist lace machines of the levers and go-through type. The back comb bar is mounted on rocking arms and can be shifted sideways one gait by a T-ended lever and cam-shaped blocks, so bobbins and carriages can be traversed along the machine. This evens out yarn use across all bobbins, giving longer lengths of lace per set of full bobbins and saving time and material. The scan has a drawing sheet (Figs. 1 and 2) and the printed specification with one claim.