Cement was patented in 1871. David Oliver Saylor, of Allentown, Pennsylvania, received patent number 119,413. Children can take some virtual tours of cement being made at: Cement.
Sep 262026
Sep 272026
Matchbook Patent
Matchbooks were patented in 1892 by Joshua Pusey of Lima, Pennsylvania. He received patent number 483,166. Children can view the patent at: Matchbook Patent.