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1999-11-21
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2002-10-30
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2001-02-21
Height adjustment device for armrest of chair
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1998-11-21
Improved structure for elevating device of height adjustment for walker
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1997-11-01
Improved structure of chair elevating device
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1997-03-21
Improved structure of height adjustment device for baby walker
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2000-04-01
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1999-01-11
Improvement of height adjustment for baby walker
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Structure of extension device suitable for foot
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2002-06-21
Height adjustment structure for sickbed
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2000-03-21
Improved structure for height adjusting device
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2000-11-01
Structure of frame for height adjustable armrest
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2001-04-21
Improved structure of device for sucking snivel
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2002-06-21
Height adjustment device for baby walker
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1998-01-11
Improved height adjusting structure of circular walker (2)
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Improved adjustment structure for baby walker
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1997-07-01
Improved height adjustable structure of baby walker
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1999-08-01
Improved structure for crutch pad of crutch
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2001-05-01
Structure of auto cement-pouring device
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1997-07-01
Improved height adjustable device of baby walker
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2001-06-16
Adjustment structure for base of chair
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2001-05-16
Auxiliary element of height adjustment for exercycle
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1999-06-28
Height adjusting device
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1998-11-21
Elevating adjustment structure for table-chair
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Improvement of switching-off device structure