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The patent-pending, hydraulically-operated 50/50 Door and Window System combines the best features from our SST-II Bi-Fold and Single-Swing Systems. The 50/50 provides an incredibly clean opening, requires minimal space in the open position and requires no maintenance, making it perfectly suited for architectural, commercial and residential designs. Solo Operation With its ease of use operation, one office personnel can operate the opening and closing of the Crown 50/50 unit making [...]