 Headquartered in Cleveland and founded in 1932 , <unk> Products employs 6 @,@ 800 residents in the state and is a major manufacturer of heavy duty lawn equipment . Advanced Drainage Systems headquartered in Hilliard employs 3 @,@ 900 residents and specializes in manufacturing industrial components and equipment . <unk> International , headquartered in Beachwood , employs 8 @,@ 500 residents and is one of the world 's largest recyclers of aluminum and zinc , manufacturing alloy sheet metal . Park @-@ Ohio , Inc . , located in Cleveland , operates in 16 countries with over 3 @,@ 000 employees . Mallory Marine is a manufacturer of aquatic travel components and located in Cleveland . Cincinnati @-@ based Michelman , Inc. is a global leader in developing water @-@ based barrier and functional coating . 
