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The RAS Diagonal is a straight copy of the MEM Diagonal. I haven't found out anything other about it than that ...
Interestingly, both RAS and MEM claim original patents. No idea which is true, haven't found the patents yet.
More descriptive post about razors and head: see MEM.
Long handle...
Mr M.E. Mayer had an export-company on the Lokowitzplatz in Vienna. For some reason he branched out into shaving. He patented a parallelogram-shaped head/blade and was granted that patent 10-12-1923. This is European notation, so probably means 10 December 1923.
The same head was also used on...