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Another custom Skewb mod by Tony Fisher with a complicated history.
This transformation of a skewb is also known as "Halpern-Meier-Tetrahedron" (short: HMT) after the two persons (Benjamin R Halpern and Kersten Meier) who first came up with this concept.
The patent behing the number given here dates back to 1981 and names Mr. Halpern as inventor.
In 1984 Aleksandr Ordynets filed a patent which covers the HMT (including trivial tips) and Trajbers Octahedron. This must be a case of parallel invention.
Tony Fisher is credited as inventor in this museum because he is the first person who is known to have actually produced one sample (by hand) , which took place in 1991.
To make the story even more confusing, in September 1981 Marko van Eekelen & Bernard van Houtum wrote a paper for their graduation. It describes drawings and solutions and mathematical descriptions of the puzzle. They never had a physically working puzzle at hand.
A very similar puzzle was presented as unrealized idea in 1982. Back then Uwe Meffert presented and equivalent puzzle in his famous catalogue. Sadly the "Pyraminx Magic Tetrahedron" (the name it beared back then) never went into production until Uwe Meffert started production of the pillowed variant named "Jing's Pyraminx" (see the related entry) after his wife.
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Thank you to the following people for their assistance in helping collect the information on this page: Geert Hellings, Gus.
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