I think you'd have to actually see it. If theres a cat dealer near you, check out an excavator there.
Theres a frame that the window fits in and locks, and it pops in toward the operator, then slides up and locks against the ceiling in the fully open position.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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