US Patent No. 1,473,094, granted 6 November 1923 to William John Hawker of Chard, England, assignor to Gifford Fox & Company Limited, for an improved lace machine. It describes a three-toed bobbin carriage for plain net lace machines, driven through the comb bars by two oscillating locker members with T-shaped or undercut teeth. The locker members are worked by racks, pinions and parallel levers from cams on a single shaft. The document includes two sheets of drawings (Figs. 1 and 2), the specification and five claims.