# Relationship history for MSHA mine 4607454

Current hierarchy: **Cole Bobby J & Ralph J Lester → Big Boot Mining Company Inc → Mine No 5**

- 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:** Cole Bobby J & Ralph J Lester → Mine No 5; 1980-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William G  Skewes → Mine No 5; 1981-08-01 to 1996-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Navaro Mining Inc → Mine No 5; 1988-02-01 to 1988-03-27; source msha-controller-operator-history
- **controller_controls_operator:** William G  Skewes → Navaro Mining Inc; 1988-02-01 to 1988-03-27; source msha-controller-operator-history
- **controller_controls_mine:** William G  Skewes → Mine No 5; 1988-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & L Welding → Mine No 5; 1988-03-28 to 1988-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Lawson Edgar L → Mine No 5; 1988-03-28 to 1988-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Lawson Edgar L → S & L Welding; 1988-03-28 to 1988-07-24; source msha-controller-operator-history
- **operator_operates_mine:** Southern Edge Inc → Mine No 5; 1988-07-25 to 1990-06-05; source msha-controller-operator-history
- **controller_controls_operator:** William G  Skewes → Southern Edge Inc; 1988-07-25 to 1990-06-05; source msha-controller-operator-history
- **operator_operates_mine:** Big Boot Mining Company Inc → Mine No 5; 1990-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cole Bobby J & Ralph J Lester → Big Boot Mining Company Inc; 1990-06-06 to current/open; source msha-controller-operator-history