Conversation so far:
when was the first bullet proof vest made
Kazimierz Żegleń was a Polish engineer, born in 1869 near Tarnopol, who invented the first bulletproof vest.
when did the engineer invent the vest
In 1893 Casimir Zeglen invented the first commercial bulletproof vest.

Question: did the vest save any lives
Self-contained rewrite: did the vest save any lives