Title:
【発明の名称】環状パツキングユニツト及びインサ-ト
Document Type and Number:
Japanese Patent JPS60501068
Kind Code:
A
Inventors:
Highness, joseph etch
Burton, The Ames A
Burton, The Ames A
Application Number:
JP50166084A
Publication Date:
July 11, 1985
Filing Date:
April 06, 1984
Export Citation:
Assignee:
High drill company
International Classes:
E21B33/06; (IPC1-7): E21B33/06
Attorney, Agent or Firm:
Asamura Akira