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Salient Information Systems

I thought it was a long shot but late last year I contacted Salient who I had seen sold Split-Flap displays way back in 2009 and funnily enough the site hasn't changed since then, however they basically said:

We are unable to help with this product type in such a small quantity. The setup and production costs for this obsolete technology is enormous and requires a sizable quantity to make it worthwhile. Think Airport or Railway station fitout size project.

http://www.salient.com.au/products-splitflap.htm