Any known supplier of Ergonomic chairs for workers on a conveyor line in a bakery?

Question

Of course these chairs are distinct from office chairs? No casters.
Task involve some twisting of the upper body.

Answer 1

I found a couple of sites:

http://www.macraesbluebook.com/search/company.cfm?company=458943

http://www.reedlink.com/CompanyProfile~CompanyId~1932501~paid~2.html

Answer 2

This site has a really huge selection of ergonomic chairs. Youmay be able to find what you are looking for there.