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2021
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Invention
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Safety opening/closing valve for easy checking of opened/closed state thereof. A safety opening/c... |
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2014
|
Invention
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Opening and closing device for valve. The present invention provides an opening and closing devic... |
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2011
|
Invention
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Pipe tapping device. Disclosed is a pipe tapping device. According to one preferred embodiment of... |
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|
Invention
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Pipe connecting socket. The present invention relates to a pipe connecting socket. According to a... |
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2007
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Invention
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The method of void free for molding product. Disclosed is a method of removing voids from a molde... |
