I'm always coming across old steam parts and fitting catalogs in my online research of Ashton Valve. I find them fascinating. Maybe you will too.
Crane Co. 1917
https://archive.org/details/va...es%2C+steam+whistles
Illinois Malleable Iron Co. 1916
https://archive.org/details/va...es%2C+steam+whistles
Best, Fox and Co. 1894
https://archive.org/details/ca...valve+steam+whistles
Walworth 1905
https://archive.org/details/Wa...valve+steam+whistles
Burnett Co. 1900
https://archive.org/details/Bu...ge/n3?q=ashton+valve
Condensed catalog 1916