From Ohio Capital Journal:

Ohioans can now secretly carry knives under a new law that took effect Monday.

Prior law prohibited anyone in the state from carrying a concealed “deadly weapon” other than a handgun. House Bill 140 codifies into the law that knives, razors, or cutting instruments not used as a weapon do not count as a “deadly weapon.”

Similarly, the new law allows for the manufacturing, sale and possession of brass knuckles, cestuses, billy clubs, blackjacks, sandbags, switchblade knives, springblade knives, gravity knives, and similar weapons.