オリエンタル興業 (Oriental Kogyo) is a company that baffles me.
They have seemingly taken machines from other companies and change the name and sometimes some of the art and then resell them. Some times they take a machine and keep the original name and improve it for the Japan market. Some times it seems they have made their own machines.
(I am going to be linking to a few machines on my other project, a foreigners' guide to eremeka arcades - 外国人のためのエレメカアーケードゲームガイド. Be sure to check that link out for vastly more information that you need about eremeka arcade machines. Click the linked names of machines in this article for a more thorough look at them.)
It's gonna get weird.