# Relationship history for MSHA mine 4604076

Current hierarchy: **Cogar Lowell E Jr-Don Mc Kenzie → Coalfield Construction Inc → Kistler 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

- **operator_operates_mine:** Stevan Coal Company → Kistler Mine No 1; 1974-04-04 to 1976-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Stepp Gale B → Kistler Mine No 1; 1974-04-04 to 1977-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Stepp Gale B → Stevan Coal Company; 1974-04-04 to 1976-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Stevan Coal Company → Kistler Mine No 1; 1976-05-10 to 1977-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Varner John → Kistler Mine No 1; 1976-05-10 to 1977-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Varner John → Stevan Coal Company; 1976-05-10 to 1977-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Stevan Coal Company → Kistler Mine No 1; 1977-05-06 to 1984-08-26; source msha-controller-operator-history
- **controller_controls_mine:** American Mountaineer Mining Inc → Kistler Mine No 1; 1977-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** American Mountaineer Mining Inc → Stevan Coal Company; 1977-05-06 to 1984-08-26; source msha-controller-operator-history
- **controller_controls_mine:** James F  Vance et al → Kistler Mine No 1; 1983-07-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Seminole Coal Inc → Kistler Mine No 1; 1984-08-27 to 1986-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Willard Billy R → Kistler Mine No 1; 1984-08-27 to 1986-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Willard Billy R → Seminole Coal Inc; 1984-08-27 to 1986-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Southern Coal & Trucking Inc → Kistler Mine No 1; 1986-03-26 to 1987-08-31; source msha-controller-operator-history
- **controller_controls_operator:** James F  Vance et al → Southern Coal & Trucking Inc; 1986-03-26 to 1987-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Thurl D  Vance et al → Southern Coal & Trucking Inc; 1986-03-26 to 1987-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Coalfield Construction Inc → Kistler Mine No 1; 1987-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cogar Lowell E Jr-Don Mc Kenzie Et Al → Kistler Mine No 1; 1987-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cogar Lowell E Jr-Don Mc Kenzie Et Al → Coalfield Construction Inc; 1987-09-01 to current/open; source msha-controller-operator-history