The first safety razors used a single-edge blade that was essentially a 4 cm long segment of a straight razor.
A flat blade that could be used alternately with this "wedge" was first illustrated in a patent issued in 1878, serving as a close prototype for the single-edge blade in its present form.
New single-edge razors were developed and used side-by-side with double-edge razors for decades.
Just so.
But once the DE was introduced, and decades before the injector razor, using a single-edge was like buying a double-edge and only using one side.
They were that much alike.
Why?
I had an uncle who used an SE razor - shaving mug, brush, and all - when all around him men used cut-throats, DE's, injectors - or even electric razors, in the case of a few hardy souls.
So strange are the habits of men.
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