# Relationship history for MSHA mine 4607412

Current hierarchy: **Lockard Roy G → Use Coal Inc → Use Coal Inc**

- 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:** Lockard Roy G → Use Coal Inc; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shepler Thomas → Use Coal Inc; 1984-07-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Use Coal Inc → Use Coal Inc; 1987-12-01 to 1990-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Shepler Thomas → Use Coal Inc; 1987-12-01 to 1990-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Petitto Antonio Jr → Use Coal Inc; 1988-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hide-Away-Farms → Use Coal Inc; 1990-04-10 to 1991-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Petitto Antonio Jr → Hide-Away-Farms; 1990-04-10 to 1991-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Use Coal Inc → Use Coal Inc; 1991-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lockard Roy G → Use Coal Inc; 1991-06-07 to current/open; source msha-controller-operator-history