Can someone help me knowing where pulse transformer are used I mean industries who use thyristor trigger isolation pulse transformer (4503/4502)etc and the major market for it (pulse transformer)?

 

Can someone help me knowing where pulse transformer are used I mean industries who use thyristor trigger isolation pulse transformer (4503/4502)etc and the major market for it (pulse transformer)?

It was a long time ago but we used them for blocking oscillators. Things have evolved quite a bit since the 1960's and I haven't used one for more than 48 years.
Millman and Taub was the textbook I used
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One place I worked we used them as base drive transformers. That was the early 1970's.