| 摘要 |
PROBLEM TO BE SOLVED: To protect life and property of a family from a burglar breaking into a house such as a robber pretending to be a home delivery serviceman. SOLUTION: A small window 1 is provided on a sliding door, and its plate is pulled down when a guest comes to form a counter 2 in order to prevent the burglar breaking into the house such as the robber pretending to be the home delivery serviceman. A slip can be exchanged without opening the sliding door. COPYRIGHT: (C)2005,JPO&NCIPI
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