# Relationship history for MSHA mine 3606050

Current hierarchy: **Aiello David J & Victor C → U S Coal Inc → Bundy 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:** Continental Coal Company → Bundy No 1; 1976-01-01 to 1981-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Hilliard Joseph T & Joseph J Iii → Bundy No 1; 1976-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hilliard Joseph T & Joseph J Iii → Continental Coal Company; 1976-01-01 to 1981-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Aiello David J & Victor C → Bundy No 1; 1980-05-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** U S Coal Inc → Bundy No 1; 1981-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aiello David J & Victor C → U S Coal Inc; 1981-08-05 to current/open; source msha-controller-operator-history