with pawl, pin, cross-piece, or the like engaging with ratchet teeth, notches, holes, or the like, spaced apart at intervals

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Patents Grantslast 30 patents

Information Patent Grant
Base mechanism of single prop capable of being unloaded at reduced...
- Patent number 10,895,154
- Issue date Jan 19, 2021
- China University of Mining and Technology
- Qiang Zhang
- A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
Information Patent Grant
Process method for withdrawing and recovering mechanical constant-r...
- Patent number 10,352,167
- Issue date Jul 16, 2019
- China University of Mining and Technology
- Jixiong Zhang
- E21 - EARTH DRILLING MINING
Information Patent Grant
3107933
- Patent number 3,107,933
- Issue date Oct 22, 1963
- E21 - EARTH DRILLING MINING
Information Patent Grant
2723104
- Patent number 2,723,104
- Issue date Nov 8, 1955
- B66 - HOISTING LIFTING HAULING
Information Patent Grant
2714498
- Patent number 2,714,498
- Issue date Aug 2, 1955
- E04 - BUILDING
Information Patent Grant
1555053
- Patent number 1,555,053
- Issue date Sep 29, 1925
- E21 - EARTH DRILLING MINING