# Relationship history for MSHA mine 4404634

Current hierarchy: **Cole Bobby J & Ralph J Lester → Big Boot Mining Company Inc → 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:** Hagerman Elbert & Douglas Looney → No 1; 1975-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fletcher Brothers Coal Company → No 1; 1977-03-01 to 1977-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Fletcher Donald & Chester → No 1; 1977-03-01 to 1977-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Fletcher Donald & Chester → Fletcher Brothers Coal Company; 1977-03-01 to 1977-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Progressive Coal Company → No 1; 1977-08-02 to 1979-09-06; source msha-controller-operator-history
- **controller_controls_operator:** Hagerman Elbert & Douglas Looney → Progressive Coal Company; 1977-08-02 to 1979-09-06; source msha-controller-operator-history
- **operator_operates_mine:** Scottdale Coal Company → No 1; 1979-09-07 to 1980-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Stacy Carl & Earnest Matney → No 1; 1979-09-07 to 1980-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Stacy Carl & Earnest Matney → Scottdale Coal Company; 1979-09-07 to 1980-06-09; source msha-controller-operator-history
- **operator_operates_mine:** Big Boot Mining Company Inc → No 1; 1980-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cole Bobby J & Ralph J Lester → No 1; 1980-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cole Bobby J & Ralph J Lester → Big Boot Mining Company Inc; 1980-06-10 to current/open; source msha-controller-operator-history