▁believe ▁that ▁pl astic ▁to ys ▁were ▁as ▁dur able ▁as ▁metal ▁to ys , ▁and ▁the ▁cost ▁of ▁re tool ing ▁their ▁tin ▁to ys ▁to ▁meet ▁federal ▁reg ulations ▁was ▁cost - pro hib itive , ▁so ▁they ▁ph ased ▁out ▁their ▁tin ▁to y ▁manufact uring ▁and ▁divers ified ▁into ▁other ▁mark ets . ▁Che in ▁acquired ▁the ▁Learning ▁A ids ▁Group ▁and ▁its ▁lines ▁of ▁educational ▁materials , ▁as ▁well ▁as ▁its ▁Ren wal ▁Pl ast ics ▁division . ▁Ren wal ▁produced ▁the ▁successful ▁series ▁of ▁an atom ical ▁k its ▁that ▁included ▁" The ▁Vis ible ▁Man ", ▁" Visible ▁Woman ", ▁" Visible ▁Head " ▁and ▁" Visible ▁Dog " ▁models , ▁as ▁well ▁as ▁scale ▁model ▁vehicle ▁k its . ▁ ▁One ▁of ▁the ▁final ▁original ▁Che in ▁to y ▁products , ▁and ▁one ▁of ▁its ▁most ▁complicated , ▁was ▁the ▁elect rome chan ical ▁" P iano ▁L ode on ", ▁a ▁child - s ized ▁player ▁piano . ▁It ▁util ized ▁a ▁combination ▁of ▁pl astic ▁and ▁tin , ▁and ▁a ▁mechanism ▁that ▁used ▁sp oo led ▁roll s ▁of ▁p unch ed ▁paper ▁with ▁well - known ▁songs ▁program med ▁onto ▁them . ▁A ▁total ▁of ▁approximately ▁ 5 0 ▁t unes ▁were ▁available . ▁The ▁piano ' s ▁keyboard ▁was ▁actu ated ▁by ▁a ▁vac u um ▁produced ▁by ▁an ▁electric ▁fan , ▁with ▁a ▁rub ber ▁t ube ▁connecting ▁each ▁key ▁with ▁a ▁corresponding ▁hole ▁in ▁the ▁front ▁of ▁the ▁piano