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Whalemen's harpoons. Fig. 1. Improved harpoon or toggle-iron now in useFig. 2, 3. First form of toggle-iron made by Lewis TempleFig. 4. One-flued harpoon with hinged toggle. Fig. 5. One-flued harpoonFig. 6. Two-flued harpoonFig. 7. Toggle-iron invented by Provincetown whaleman; not in use (Image credit: NOAA National Marine Fisheries Service)