Caltrops (Tire-Popping Spikes) - Mikes Inventions

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Ecodefense: A Field Guide to Monkeywrenching

Night Watchman Railroad Spike Caltrop Solid Iron

Caltrops 101

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How to make caltrops

2-3 tires a day pierced by 'ninja caltrops' in South Lake

Ecodefense: A Field Guide to Monkeywrenching

Road Tack Dispensing System - Armormax