| 摘要 |
An exterior window unit is adapted to cover an opening in a building wall. A frame sill has a vertical mounting portion adapted to be mated with and secured to a fixed sill in the building wall. The frame sill has a plurality of rail portions extending along the length of the vertical mounting portion and spaced vertically along the height thereof. A plurality of sashes are mounted within the window frame in parallel closely spaced planes and have at their respective lower edges engaging means with which the rail portions engage for guiding the horizontal movement of the sashes therealong.
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