𝔖 Bobbio Scriptorium
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4735267 Flexible production riser assembly and installation method

✍ Scribed by James Stevens

Book ID
116024550
Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
175 KB
Volume
19
Category
Article
ISSN
0025-326X

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This patent describes the manufacture of a seal with graded properties that may be used as the bearing seal in a down-hole rock bit. A property gradient is formed in a seal, or a section of the seal, from the exterior surface inwards without changing the seal composition.