I came across these interesting videos from India. The sirens with the funny (almost hilarious) names are variations of the standard carter-like style of India. It seems there are a lot of small companies - machine shops that produce these types. They look pretty raw and primitive to me.
https://www.youtube.com/watch?v=3wQkYDOye7w
https://www.youtube.com/watch?v=V2MRr8WGDpA