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. The property change is crea
Seal detects tampering
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 247 KB
- Volume
- 2000
- Category
- Article
- ISSN
- 1350-4789
No coin nor oath required. For personal study only.
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