1872 10 121 (list) Grain riddles... Meat rocker.
a1884 E. H. Knight Suppl. 591/1 Meat rocker, a mincing knife having a handle at each end, and worked by a rocking motion.
1918 19 June 21/2 (advt.) For Sale—One 54″, Nine Knife Meat Rocker; good condition.