The Ashton Valve Co., established 1871 ...
Subtitle: manufacturers of pop safety valves for locomotives, steamships, steam fire engines, stationary and portable boilers ...
Publisher: Ashton Valve Co.
Published: 1880
Place of publication: Boston
Language: eng
Notes: Pages numbered 1, 28, 29, 27.

Circular describing Ashton locomotive pop safety valves and noiseless blow-back safety valves for locomotives.