Have you ever seen breakers like these in an AF Transformer?

I helped a friend out with his 30B (dead spots and hots spots), and in the process noticed circuit breakers inside that I do not recognize.  Are any of you familiar with them?  Did Gilbert use them or must they be aftermarket units installed by someone else later?  I've always seen the bi-metalic points type.  They are nicely held in place by clearly purpose-built brackets.  I think I found the breaker on the internet - click here.  But what about those brackets?  Do you have any input, observations, experience with, or advice on these to share?  Thanks.

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