Meaning of AB in this description

tab a said:
Several resistors R224, 237, etc., on this part list have AB at the end of the description. What's the AB mean?

Thanks.

www.dvq.com/hifi/images/st410.pdf
Click to expand...

Back in that era, a company called Allen Bradley made resistors and had a large market share (largest?).. Perhaps, that is what they are specifying on the schematic. I believe AB also made flame-proof resistors & surge types also..
 
<safety components?, non-flammable>

Well, I did my best (worst?) to flame one!

Thanks guys.
 
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