Several different US & Japanese companies came out with that type of reticle, not long after the first was introduced in the US.
The various offerings were virtually identical to one another, with a few makers offering a more prominent version in addition to the standard one.
The various companies took out TradeMarks, for their own version, so one company's was a "Duplex" reticle, another a "4-Plex" reticle, another a "30-30" reticle, a "Thick'nThin", etc, etc, etc - there seemed no end to the ingenuity of name creation.
ALL were copies of the old German reticle, with the outer part of the crosshairs 4x thicker than the central part, so they looked like slim posts.
Most makers gave the separation distance value @ 100yds in the scope's specs, so the reticle center area could also be used as a range finder.
Others tapered the four thick sections, so there was no visible "step" between the thick and the thin crosshairs.
A chicken for every pot, as it were.
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