Dear Kaspar family

I am researching two Frank Kaspars that were famous clarinet mouthpiece makers. Frank L was born in or near Pilsen, Bohemia in 1888
and emigrated to Chicago in 1904.

The other Frank was, I believe, born in 1902.
He was a cousin to Frank L. This Frank died in 1989 in Cicero Ill.

Any information on either of these venerated men would be greatly appreciated

Clark W Fobes