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Cyclops frame
Wow. Googling reveals that the double wishbone seat stay was the signature of Mike Mulholland of Cyclops, possibly for increased stiffness. He put it on track bikes and road bikes. A few other people have made a single wishbone. He seems to be the only one known to Google who made a double. But like so many other modern novelties it was probably dreamed up in Victorian/Edwardian times.
Cyclops frame from 20 years ago, whether it’s for style or functionality I don’t know?