There something I have always found a little strange and that is, Nikon is owned by Mitsubishi but Nikon gets some of it's sensors from Sony who is a direct and major competitor to Mitsubishi! any body else find this a strange arrangement?
You need to study some more.
Nikon is a publically owned company, its owned by its shareholders. However, companies in Japan join loosely joined groups that have banded together in a group called a Keiretsu to support each other financially.
The member companies own small portions of the shares in each other's companies, centered on a core bank; this system helps insulate each company from stock market fluctuations and takeover attempts, thus enabling long-term planning in innovative projects. It is a key element of the automotive industry in Japan.
Back in the 1920's and 1930's these groups were monoploistic and were called zaibatsu.http://en.wikipedia.org/wiki/Keiretsu http://en.wikipedia.org/wiki/Mitsubishi