That is almost like asking how many women use an ultra bra!
Manufacturers did not have an exclusive use of parts as far as i am aware and have found.
The parts supplied into the production could come from a number of makers.
Getama are known for using the epeda sprung cushion as was france & son but they were also used by other lesser known furniture makers.
There are companies who supply all from shelf pegs to folding bed mechanisms. Hafele is one such company.
I know that getama no longer uses epeda cushions as the last factory in denmark making them has ceased production.
I don't think glassartist is saying there was an exclusive on furniture parts anywhere.
I think an amplification of his question is the observation that the use of those flattened coil springs, stretched across the seat as these are is not particularly widespread among danish furniture manufacturers. In fact France and Søn, his given example, is the only one I can think of. But this chair is not France and Søn.
So the question is: which other manufacturers used these flattened coil springs in this way?
Another way I have tried to get at this mystery is the cut in at the top of the posts are suggestive of possibly a stylistic match with a potential drop arm sofa (If there were a suite of these made) done like the famous Mogensen one. The cut in parts being to hold cord for lowering the arms. I have searched drop arm sofas and so far no luck that way either.
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