Was it the YYF G5? I’m trying to think of other non round shapes that may have come earlier but none come to mind. All the YYJ stuff I can think of was round.
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Envy?
Didn’t even think of that one! Looks like the G5 preceded it by a few months though.
@Nathan? Do you know?
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Ah okay, wasnt sure. Whenever I think of H shape the envy comes into my head with all its ugly glory 
Interesting topic. @yyfben2.deactivated May have some insight as well
G5 and Envy were developed almost simultaneously if I recall correctly.
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We were first to market, Envy was way more radical.
Go to USPTO.gov and look at yoyo patents. nothing is new.
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