Here is what we use around the fire service and EMS. With its spring loaded punch and serrated edge it is very handy around auto-vehicle accidents.
http://store.smith-wesson.com/conten...0000_large.jpg
Were you thinking of integrating the punch into a knife or a stand alone item? S&W pretty much has the market sewn up with the knife above, as there is no other widely marketed knives with such a feature.
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