The step ladder 3 further comprising a bar slidably attached to at least one of said lower back leg, said upper back leg, and said lock plate, said bar slidable between a first position interfering with {HEAD ~ pivoting} of {TAIL ~ said lock plate} and a second non interfering position 
of
The step ladder 3 further comprising a bar slidably attached to at least one of said lower back leg , said upper back leg , and said lock plate , said bar slidable between a first position interfering with { HEAD ~ pivoting } of { TAIL ~ said lock plate } and a second non interfering position
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