Another illustrative case is the 1960 decision in "American-Marietta Co. v. Krigsman", involving a sponge-mop replacement (for installation after the original sponge becomes worn out). The plaintiff did not attempt to protect functional features of the product, but only sought to prevent the copying of the nonfunctional arrangement of slots in the metal "presser plate" (hinged to the bottom of the mop) which is pressed against the sponge to squeeze water out. The rule against nonfunctional copying, the Second Circuit held (in an opinion by Judge Learned Hand), is restricted to cases where the nonfunctional element has acquired a secondary meaning: