Luger patented the hold open in May, 1900. An angled cut improvement was patented 7 years later.
In 1901, a weapons commission complained about the number of parts in a Luger, and the hold open and it's spring were two of the parts that were eliminated.
If I remember correctly, the first issue P.08 military Lugers deleted the hold open.
Some time between 1909 and 1911, the army determined that eliminating the hold open had been a mistake.
In May, 1913, the Prussians issued regulations to restore the hold open device. They also ordered that all existing stock be retro-fitted at the Erfurt arsenal. The majority of existing pistols without hold opens were retro-fitted.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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