# Relationship history for MSHA mine 4405715

Current hierarchy: **Mitchell Harold L → G & M Coal Company Inc → Mine #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** M M & S Coal Company Inc → Mine #1; 1981-08-01 to 1985-05-02; source msha-controller-operator-history
- **controller_controls_mine:** Monk Archie → Mine #1; 1981-08-01 to 1985-05-02; source msha-controller-operator-history
- **controller_controls_operator:** Monk Archie → M M & S Coal Company Inc; 1981-08-01 to 1985-05-02; source msha-controller-operator-history
- **operator_operates_mine:** Marvel Mining Inc → Mine #1; 1985-05-03 to 1987-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Blackwell Gentry Et Al → Mine #1; 1985-05-03 to 1987-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Blackwell Gentry Et Al → Marvel Mining Inc; 1985-05-03 to 1987-03-01; source msha-controller-operator-history
- **operator_operates_mine:** G & M Coal Company Inc → Mine #1; 1987-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mitchell Harold L → Mine #1; 1987-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mitchell Harold L → G & M Coal Company Inc; 1987-03-02 to current/open; source msha-controller-operator-history