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Alt cannot be turned on without it turning the Battery switch half on, ie push the Alt half in and the Battery half goes in too.
Battery can be turned on, on its own without turning the Alt switch half on.
Once Battery half is on Alt can be turned off and on independently as long as battery half remains on.. Two switches built into one item.
Mechanically, one switch assembly. Electrically, two independent switches.
Semi Independant as you cannot electrically operate one without the other.
