German shellpuller hunting knives - Jagdmesser mit Patronenzieher
In the early 1900s most shotguns did not have shotshell extractors. This could be a problem because early shotshells were made of paper, not plastic, and often got 'stuck' once the shotgun was fired. And because they were hot, hunters were less than happy to pull them out with their fingers. As a result, cutlers began making pocket knives with extractors using gauge sizes 12, 16, and 20.
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