“An Inspector of Weights & Measures testing a gasoline meter with a Seraphin Field Standard.” (undated)
“An Inspector of Weights & Measures testing a gasoline meter with a Seraphin Field Standard.” (undated)
“An Inspector of Weights & Measures testing a gasoline meter with a Seraphin Field Standard.” (undated)
“An Inspector of Weights & Measures testing a gasoline meter with a Seraphin Field Standard.” (undated)