US Patent 4,848,411 (granted July 18, 1989) to Narachiyo Nishiguchi of Osaka describes an electrical warp stop motion for looms. Droppers fall when a warp yarn breaks and close a circuit between upper and lower contact bar supports that slide on the loom side frames, stopping the loom and helping locate the broken thread. The document includes the abstract, a single claim, background on the prior art with a separate grip, a description of the preferred embodiment, and patent drawings (Figs. 1-6). It is supplied both as a USPTO web printout and as the printed patent.