For the first time for 22 kV distribution lines they used pin type insulators. Nowaday you can still see them in use but from time to time they are being replaced by line post and pin-post insulators.
The line post insulators are replacing the pin type insulators
The pin post insulators are the best insulators. They mix the quality of both pin type and line post insulator together. But you may not see them very often. May be because of the cost which is higher.
