# Relationship history for MSHA mine 4102803

Current hierarchy: **Chevron Corporation → Farco Mining Inc → Farco 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:** Farco Mining Company Of Texas → Farco Mine; 1978-10-01 to 1998-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Farrell Construction Company → Farco Mine; 1978-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Farrell Construction Company → Farco Mining Company Of Texas; 1978-10-01 to 1998-08-30; source msha-controller-operator-history
- **operator_operates_mine:** Farco Mining Inc → Farco Mine; 1998-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chevron Corporation → Farco Mine; 1998-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chevron Corporation → Farco Mining Inc; 1998-08-31 to current/open; source msha-controller-operator-history