Inventor Name
Gratz, Henry M.
Repository
Historical Society of Pennsylvania
1300 Locust Street
Philadelphia, PA 19107
Phone: 215-732-6200
http://www.hsp.org
Physical Description
ca. 50 items
Summary
Miscellaneous records from members of the Gratz Family of Philadelphia. Includes a patent certificate issued to Alfred Gratz for an attachment to a talking machine (1903).