The Disputed Origins of the Butterfly Knife Balisong knife history

What's your opinion on butterfly knives? - Quora

The History and Origins of the Butterfly Knife – Squid Industries

2 Butterfly Knives Incl Balisong

How to use a butterfly knife by Grommet's Knife and Carry - All about butterfly knives by Grommet's Knife and Carry - Learn how to hold and use a butterfly knife

The history of the balisong knife

What is the purpose of the balison/butterfly knife ? : r/balisong

2 Butterfly Knives Incl Balisong

Origin & History of Butterfly Knife, A Short View – Nabalis

​Interesting Facts About Custom Survival Knives You May Have Not Known - EKnives LLC