German Reich patent specification no. 461982 for a hand loom by Etablissements P. B. Van Haver of Hamme-sur-Durme, Belgium. The loom derives the harness (shaft) movement from the swinging motion of the beater, using a rocker arm on the beater, notched rods attached to the shafts, and a pivoting switch and bracket that alternately engage the rods to form the shed. The document gives the description, one patent claim, and a sheet of five drawings (Abb. 1-5) showing the mechanism.