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kolo50

sliding windows

13 years ago
seen some special sliding windows[in UK] where they can be tilted 45 degrees and at same time one can pull one side to slide open away from the second half [on another rail] to the back of the second one.
The best about them they are noise-free,dust tight when they are closed.When they are closed they closed face-to- face on same rail.
anybody know what they are called? where to find?

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