Hey now... Maxim had the toggle mechanism working in a machine gun!
We know that Mauser worked on several different approaches for a semi-automatic high power rifle for Germany. He never really succeeded.
Some of the designs included toggle based mechanisms. Since Georg Luger didn't mind stealing other people's ideas (including filing a patent on Mauser's 3 lug bolt system in Luger's own name) Mauser and others didn't mind appropriating the basic systems approaches used by others.
Many of the Mauser designs required greased cartridges, which the military found unacceptable. The problem was extraction, and they were not yet experimenting with fluted cartridge chambers to cope with the issue...
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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