The first commercial bulletproof vest was invented by a Polish Catholic priest, Kazimierz Żegleń. He experimented with steel shavings, moss and hair before settling on... silk.

Casimir Zeglen - Wikipedia

Kazimierz Żegleń (Casimir Zeglen) was a Polish engineer, born in 1869 near Tarnopol, (died not before 1927[1]), who invented the first en.wikiped…
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