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what is the typical field of application for such a double chain?
Dunno. It would work well where you want the force capacity of a single pitch chain of the same roller size with lighter weight, for 1:1 motion translation where you could clock the sprockets to eliminate the chordal action. Synchronisation chain on a tandem would be an obvious cycling example.
gbj_tester
what is the typical field of application for such a double chain? These things...?