The Parts of the Deadly Katana Sword • Sword Encyclopedia
Why do swords have a groove? - Quora
What are Blood Grooves? | The Writer's Guide to Weapons
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The function of blood grooves on a sword
Fuller not blood groove - NOT for "letting blood out"! - YouTube
Japanese Katana Full Tang Real Steel With Blood Groove Samurai Sword Sharp Blade | eBay
Bo-Hi VS. No-Hi Blade - Parts of a Japanese Katana
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Hand Forged Samurai Sword Blood Grove Blade - Edge Import