OK, battery tool question. When did the standard two-brush post cleaner come into regular use? Blue Bird has the spring shaper/cleaner, and a two brush cleaner. Wondering when one replaced the other.
The two brush cleaner isn't in the catalog I have (I want to say it's pretty early), but then, neither is the carrier in there, either. Perhaps we can narrow it down by figuring out when modern car battery styles were introduced with tops sealed in plastic not tar?