# Relationship history for MSHA mine 4801340

Current hierarchy: **Drummond Company Inc → Caballo Rojo Inc → Caballo Rojo Mine**

- 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:** Mobil Coal Producing Inc → Caballo Rojo Mine; 1981-02-01 to 1991-12-16; source msha-controller-operator-history
- **controller_controls_mine:** Mobil Corp → Caballo Rojo Mine; 1981-02-01 to 1991-12-16; source msha-controller-operator-history
- **controller_controls_operator:** Mobil Corp → Mobil Coal Producing Inc; 1981-02-01 to 1991-12-16; source msha-controller-operator-history
- **operator_operates_mine:** Caballo Rojo Inc → Caballo Rojo Mine; 1991-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Drummond Company Inc → Caballo Rojo Mine; 1991-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Drummond Company Inc → Caballo Rojo Inc; 1991-12-17 to current/open; source msha-controller-operator-history