Historical information on Hall's Safe & Lock Company?

Hello!
I'm an historical interpreter in a living history museum here in Iowa. We have a working 1876 Hall's time-lock safe that we demonstrate to guests. But I cannot find online any general/historical information on the Hall's company. Does anyone know of anything?

Thank you for any assistance!

Kent S.

A good place to start is the My-Time-Machines website. Lots of info there on Jos L. Hall and his timelocks.

Thank you!