Actually Leo K. explained the "lift&cut"-system already - just saying. Gillette coined the the term for this process
Hysteresis.
I don't think that's true. While it wasn't marketed explicitly anymore, it was still the base (marketing) principle for "a closer shave" of all multi-blade cartridges made by Gillette (and their knock offs) - including up to the Fusion (see link above).
That's why all of them gave me ingrown hairs occasionally.
I started with the Atra and shortly after the Sensor came out.
Third parties here in Germany also sold single blade cartridges that fitted either the Trac/GII or Atra/Contour handle. I loved them because they were way cheaper and gave me no ingrown hairs. When they were discontinued I used Trac only because they were still the cheapest blades but caught up fast. The Fusion gave me smooth shaves but were way to expensive.
But each new model added its own
USPs (why else upgrade) to charge more $$$.
Trac II/GII: 2 Blades. Hysteresis = closer.
Atra/Contour Plus: Pivoting head. Plus = lubra strip -
first we made it closer, than we made it $moother It's
the best a man can get. It can't get any better, or can it?
Personally I think this was the best cartridge razor Gillette ever made.
Sensor (Excel): Spring loaded blades for an even $moother shave.
Excel = "Microfins" lift the hair - designed more like a Mach3 cartridge but fits the Sensor handle.
Venus - I think Wiki is wrong here. The First Venus razor used Sensor cartridges, not Mach3 cartridges. I think the short handled Venus really was an innovation for shaving your legs though - and they finally could use their own razor. Let's also change the color - because women love color - and charge some extra $$$ for the same cartridges.
Mach3: Well, how can we still charge more $hit? Let's just add another blade and make a new cartridge format. It's a $moother shave and waaay faster of course - because fewer strokes - 1 instead of 3, dummy.
I skipped the Mach3. For some reason the Atra and Sensor gave me smoother shaves and were cheaper anyway.
Sensor Excel 3: It came out after the Mach3 if I'm not mistaken? Why did they even make it? Prototype of Mach3?
Fusion: We're out of ideas - let's just repeat all the $hit we did before and add even more blades (because
3 blades simply don't cut it) and charge way more $$$ - now the distance of the blades makes all the difference, stupid.
Sensor, Mach3 (Venus) and Fusion all had their different variants that added new cool $tuff.
Turbo= less friction, Power=vibration/battery - well, batteries are cool, aren't they? Powerball = even more pivoting, etc..
And then they rode the
woke train - epic fail.

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