This TypeMatrix may be the first keyboard using the term “ortholinear” (not the first ortho one, of course). We had both previously used keyboards by TypeMatrix, who had begun using the term “ortho-linear” to describe the layout no later than 2003 — I haven’t been able to find any earlier uses.

While I still don’t get how most non-split ortho boards can be considered ergonomic, the TypeMatrix at least has larger inner keys and a small gap between the halves, slightly alleviating at least ulnar deviation.