Title: Butterfly valve
Patent number: 23,902
Date granted: 5/10/1859
View this patent at the USPTO.
Inventor: W. Hodgson
Inventor: N. Cope
Title: Butterfly valve
Patent number: 23,902
Date granted: 5/10/1859
View this patent at the USPTO.
Inventor: W. Hodgson
Inventor: N. Cope