# Relationship history for MSHA mine 2200114

Current hierarchy: **Douglas  McCormick; Tim  Parker → North Mississippi Gravel Co., LLC → North Mississippi Gravel Co., LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Mississippi Sand & Gravel Company → North Mississippi Gravel Co., LLC; 1950-01-01 to 1992-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Cindy  Tharp et al → North Mississippi Gravel Co., LLC; 1950-01-01 to 1992-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Cindy  Tharp et al → Mississippi Sand & Gravel Company; 1950-01-01 to 1992-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Mississippi Gravel Sales Inc → North Mississippi Gravel Co., LLC; 1992-10-01 to 2004-10-31; source msha-controller-operator-history
- **controller_controls_mine:** William R  Carroll → North Mississippi Gravel Co., LLC; 1992-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William R  Carroll → Mississippi Gravel Sales Inc; 1992-10-01 to 2004-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Mississippi Gravel Sales LLC → North Mississippi Gravel Co., LLC; 2004-11-01 to 2017-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Chris C Todd et al → North Mississippi Gravel Co., LLC; 2004-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris C Todd et al → Mississippi Gravel Sales LLC; 2004-11-01 to 2017-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Elmer J Todd et al → Mississippi Gravel Sales LLC; 2004-11-01 to 2017-09-30; source msha-controller-operator-history
- **operator_operates_mine:** North Mississippi Gravel Co., LLC → North Mississippi Gravel Co., LLC; 2017-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Parker et al → North Mississippi Gravel Co., LLC; 2017-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Parker et al → North Mississippi Gravel Co., LLC; 2017-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  McCormick et al → North Mississippi Gravel Co., LLC; 2017-10-01 to current/open; source msha-controller-operator-history