# Relationship history for MSHA mine 1508129

Current hierarchy: **Cornett Darrell → 4-D Coal Company Inc → Ronco 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:** M & S Coal Company → Ronco No 1; 1975-03-10 to 1976-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Metcalf Kellis → Ronco No 1; 1975-03-10 to 1976-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Metcalf Kellis → M & S Coal Company; 1975-03-10 to 1976-05-20; source msha-controller-operator-history
- **operator_operates_mine:** M & S Coal Company → Ronco No 1; 1976-05-21 to 1978-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Smith Jimmy & Richmond → Ronco No 1; 1976-05-21 to 1978-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Smith Jimmy & Richmond → M & S Coal Company; 1976-05-21 to 1978-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Smith Coal Company → Ronco No 1; 1978-10-22 to 1981-06-18; source msha-controller-operator-history
- **controller_controls_mine:** Smith Roger-Raymond-Curtis & Jerry → Ronco No 1; 1978-10-22 to 1981-06-18; source msha-controller-operator-history
- **controller_controls_operator:** Smith Roger-Raymond-Curtis & Jerry → Smith Coal Company; 1978-10-22 to 1981-06-18; source msha-controller-operator-history
- **operator_operates_mine:** Elite Mining Inc → Ronco No 1; 1981-06-19 to 1982-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Florence  King → Ronco No 1; 1981-06-19 to 1982-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Florence  King → Elite Mining Inc; 1981-06-19 to 1982-07-08; source msha-controller-operator-history
- **operator_operates_mine:** Elite Mining Inc → Ronco No 1; 1982-07-09 to 1983-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Kilgore Danny → Ronco No 1; 1982-07-09 to 1983-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Kilgore Danny → Elite Mining Inc; 1982-07-09 to 1983-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Elite Mining Inc → Ronco No 1; 1983-01-26 to 1985-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Blevins Bay → Ronco No 1; 1983-01-26 to 1985-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Blevins Bay → Elite Mining Inc; 1983-01-26 to 1985-01-09; source msha-controller-operator-history
- **operator_operates_mine:** 4-D Coal Company Inc → Ronco No 1; 1985-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cornett Darrell → Ronco No 1; 1985-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cornett Darrell → 4-D Coal Company Inc; 1985-01-10 to current/open; source msha-controller-operator-history