Herman,
You know Zeagle history better than that!
2000 was the transition year... old Apeks made regs preceeded that by about 8 years, and now 7 years of Zeagle made regulators.
Zeagle regulators have some Apeks design similarities - the dry sealed 1st stage - the 2nd stage venturi device - and the 2nd stage valve, most noticeably.
Our 1st stage conical valve design was Poseidon influenced.
A compact conventional 2nd stage case was in use by Atomic & Scubapro.
And we have an IDI look alike exhaust T.
Some of our new models have some Sherwood influences.
Chad