Pretty certain that was done at the inception of the forum. It was intended(as best it could) to initiate those new to razors as to various grinds and was obviously borrowed from somewhere and posted for eternity. Much more has been learned since then.
For example, look at what is being stated as a concave razor. Most ordinary razors are concave. The one depicted was made before good concave grinds became the norm. Yes, the blade below the massive spine is sometimes concaved. Sometimes the lower portion is a fairly thin true wedge.
This info is named from what was proclaimed upon the razors. Many have been stamped and engraved with 'Concave Razor', but we know what a concave razor actually is....Don't we? :shrug: Figures 1 throug 6 are examples of concave grinds. Why do we need to see a Microtome there? The razor depicted is a half-rattler. Not a 'concave' razor!