# Relationship history for MSHA mine 4002850

Current hierarchy: **Fowler Tommy R → Lake City Mining Company Inc → Mine No 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

- **controller_controls_mine:** Anderson Robert W → Mine No 1; 1981-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Midland Auger Company Inc → Mine No 1; 1984-03-01 to 1984-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Albert E → Mine No 1; 1984-03-01 to 1984-07-30; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Albert E → Midland Auger Company Inc; 1984-03-01 to 1984-07-30; source msha-controller-operator-history
- **operator_operates_mine:** San Jose Minerals & Development Company Inc → Mine No 1; 1984-07-31 to 1984-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Anderson Robert W → San Jose Minerals & Development Company Inc; 1984-07-31 to 1984-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Century Coal Corp → Mine No 1; 1984-09-12 to 1985-07-07; source msha-controller-operator-history
- **controller_controls_mine:** Childers Michael & Pat Et Al → Mine No 1; 1984-09-12 to 1985-07-07; source msha-controller-operator-history
- **controller_controls_operator:** Childers Michael & Pat Et Al → Century Coal Corp; 1984-09-12 to 1985-07-07; source msha-controller-operator-history
- **operator_operates_mine:** Lake City Mining Company Inc → Mine No 1; 1985-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fowler Tommy R → Mine No 1; 1985-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fowler Tommy R → Lake City Mining Company Inc; 1985-07-08 to current/open; source msha-controller-operator-history