PASxS,
Yes all three guns (Hollenbeck, Three Barrel Gun Co. and Royal) have the same design. All are the same guns. The company went through several financial restructurings during the course of their operations. There are factory records (copies) out there. Dave (Researcher) wrote a great article on them in the DGJ a while back. Also made a SBT trap gun off of Lefever’s patent. Cool guns!
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