# Relationship history for MSHA mine 4404746

Current hierarchy: **Stacy Monroe → D D & M Mining Inc → No 9**

- 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

- **controller_controls_mine:** Myers Robert L → No 9; 1974-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M S & M Coal Company → No 9; 1977-06-01 to 1981-12-07; source msha-controller-operator-history
- **controller_controls_operator:** Myers Robert L → M S & M Coal Company; 1977-06-01 to 1981-12-07; source msha-controller-operator-history
- **controller_controls_mine:** Boyd  Keen et al → No 9; 1977-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K & C Coal Company Inc → No 9; 1981-12-08 to 1986-05-28; source msha-controller-operator-history
- **controller_controls_operator:** Boyd  Keen et al → K & C Coal Company Inc; 1981-12-08 to 1986-05-28; source msha-controller-operator-history
- **controller_controls_operator:** Estel  Crouse et al → K & C Coal Company Inc; 1981-12-08 to 1986-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Stacy Monroe → No 9; 1984-06-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D D & M Mining Inc → No 9; 1986-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stacy Monroe → D D & M Mining Inc; 1986-05-29 to current/open; source msha-controller-operator-history