When was the first mechanical broadhead patented? Or, when was the first one marketed?

[nigins ⭐ Find all posts View Profile Close nigins]

When was the first mechanical broadhead patented? Or, when was the first one marketed?

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Barrie Archery?

[Buckshott00 ⭐⭐⭐ Find all posts View Profile Close Buckshott00]

Invented, patented, and marketed are probably different thing in this case. Archers had been experimenting with mechanical broadheads all the way back into the 1950s.
Rocket arrow heads are probably the first ones to make it into mass market back in the late 80's but there are known expanding heads all the way back to 1956 if not earlier.