| 摘要 |
Improved door capable of opening it toward narrow room is described. The door is comprised of separated band-type boards(1) and sheets(2) being inserted into 1 with the sandwich form. The sheets of band-type boards(1) are fixed by the sheet pieces(a) (b) being set oppositely, wherein a is thinner than b. The different length of sheet piece(a) (b) makes the door openable toward only one direction.
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