# Relationship history for MSHA mine 4800078

Current hierarchy: **Ranchester Resources Inc → Becor → Roncco**

- 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:** Roncco Coal Company → Roncco; 1950-01-01 to 1978-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Roncco Leo → Roncco; 1950-01-01 to 1978-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Roncco Leo → Roncco Coal Company; 1950-01-01 to 1978-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Becor → Roncco; 1978-09-22 to 1979-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Bessinger B L → Roncco; 1978-09-22 to 1979-01-07; source msha-controller-operator-history
- **controller_controls_operator:** Bessinger B L → Becor; 1978-09-22 to 1979-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Becor → Roncco; 1979-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ranchester Resources Inc → Roncco; 1979-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ranchester Resources Inc → Becor; 1979-01-08 to current/open; source msha-controller-operator-history