201900553

   
(21)201900553    (13) A3
(22)2019.12.13

 A ]   B ]   C ]   [ D ]   E ]   F ]   G ]   [ H ] 

:      


2020.10.30
2020-10  
201900553  

(51) C22C 33/02 (2006.01)
C22C 38/02 (2006.01)
C22C 38/28 (2006.01)
C22C 29/02 (2006.01)
B22F 3/14 (2006.01)
B82Y 30/00(2011.01)
(43)A2 2020.08.31 08  .,  
A3 2020.10.30 10  .,  
(31)2018146793
(32)2018.12.27
(33)RU
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