I've had this pair of stamps in my collection for decades, labeled "ventilator" cancels, which I assumed without research was a form of "disinfected mail."
Today when I checked for more information, I discovered that these "ventilations" were not designed to prevent the spread of contagious diseases, but rather to prevent the reuse of the stamps. Here is some relevant information from the Swedish Postal Museum:
"The "ventilator" cancel (ventilatorstämpel) featured a specialized postmark wheel with built-in, fan-like rotating blades. When the postal clerk pressed the device onto a letter, the wheel spun and physically cut or punctured small, geometric slits directly into the paper fibers of the stamp. If anyone tried to steam or peel the stamp off the envelope to reuse it, the stamp would tear apart along those slits. Because the security incisions resembled the radial slats of an air vent or ventilation fan, philatelists nicknamed it the "ventilator" cancel. Similar mechanical safety trials from that era included the bikupestämpel ("beehive" cancel) and the sågtandsstämpel ("saw-tooth" cancel)."
I have some beehive cancels I can post in the future. Sawtooth ones are apparently exceedingly rare, presumably because they were used only for a short period of time and because anyone trying to remove the stamp to put it in a collection would have wound up with a severely damaged stamp. The green 5o stamp on the right has a small triangular defect best seen when viewed with my digital microscope:
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