# Relationship history for MSHA mine 2000880

Current hierarchy: **Amber  Hoover; Amy  Watson; James  Sturrus Jr → High Grade Materials Co. → Wheeler Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Wheeler Transit Mix → Wheeler Pit; 1950-01-01 to 1985-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Gerald  Shaw → Wheeler Pit; 1950-01-01 to 1985-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Gerald  Shaw → Wheeler Transit Mix; 1950-01-01 to 1985-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Wheeler Transit Mix → Wheeler Pit; 1985-05-01 to 1986-06-19; source msha-controller-operator-history
- **controller_controls_mine:** D Lee  Satterlee → Wheeler Pit; 1985-05-01 to 1986-06-19; source msha-controller-operator-history
- **controller_controls_operator:** D Lee  Satterlee → Wheeler Transit Mix; 1985-05-01 to 1986-06-19; source msha-controller-operator-history
- **operator_operates_mine:** Wheeler Transit Mix Company → Wheeler Pit; 1986-06-20 to 2002-12-31; source msha-controller-operator-history
- **controller_controls_mine:** James P  Sturrus → Wheeler Pit; 1986-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James P  Sturrus → Wheeler Transit Mix Company; 1986-06-20 to 2002-12-31; source msha-controller-operator-history
- **controller_controls_mine:** James P  Sturrus → Wheeler Pit; 1998-05-01 to 2019-04-30; source msha-controller-operator-history
- **operator_operates_mine:** High Grade Materials Co. → Wheeler Pit; 2003-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James P  Sturrus → High Grade Materials Co.; 2003-01-01 to 2019-04-30; source msha-controller-operator-history
- **controller_controls_mine:** James  Sturrus Jr et al → Wheeler Pit; 2019-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Sturrus Jr et al → High Grade Materials Co.; 2019-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amy  Watson et al → High Grade Materials Co.; 2019-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amber  Hoover et al → High Grade Materials Co.; 2019-05-01 to current/open; source msha-controller-operator-history