Title: Apparatus for ascertaining the amount of acid in liquids
Patent number: 99,976
Date granted: 2/15/1870
View this patent at the USPTO.
Inventor: Henry Twitchell
Title: Apparatus for ascertaining the amount of acid in liquids
Patent number: 99,976
Date granted: 2/15/1870
View this patent at the USPTO.
Inventor: Henry Twitchell