-
-
公开(公告)号:CA449161A
公开(公告)日:1948-06-15
申请号:CA449161D
Applicant: SHELL DEV
Inventor: BALLARD SEAVOR A , HAURY VERNON E
-
公开(公告)号:CA446316A
公开(公告)日:1948-01-20
申请号:CA446316D
Applicant: SHELL DEV
Inventor: BALLARD SEAVER A , HAURY VERNON E
-
公开(公告)号:CA415069A
公开(公告)日:1943-09-07
申请号:CA415069D
Applicant: SHELL DEV
Inventor: MCALLISTER SUMNER H , HAURY VERNON E
-
-
-