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But on blade cartridges made since about 1953, they relate to both plants and dates.
Plastic razor cases produced since 1950 have dates built into their manufacturing codes. Razors in blister packaging also have manufacturing codes with date information, as well as copyright information that generally gives at least a few years span.
After all, they all look just the same, don't they? But look again, there's more to this razor than meets the eye.
Subtle changes and refinements occurred on a regular basis.
But through it all, from 1935 right into the 2000's, the basic mechanism remained the same.
A 1935 blade injector works just fine in a 2003 Injector Razor, and vice versa.
Eversharp seemed to want to rename the Schick Injector Razor, perhaps because of confusion with the by then successful Schick Dry Shaver.