Title: Water indicator for steam boilers
Patent number: 21,699
Date granted: 10/05/1858
View this patent at the USPTO.
Inventor: Martin Robbins
Inventor: John Frisbie
Title: Water indicator for steam boilers
Patent number: 21,699
Date granted: 10/05/1858
View this patent at the USPTO.
Inventor: Martin Robbins
Inventor: John Frisbie