# Relationship history for MSHA mine 1508090

Current hierarchy: **Vitale Louis → Far-Del Coal Co Inc & Intercontinental Coal Inc → Green Grove 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:** Green Grove Coal Company → Green Grove Mine; 1975-02-04 to 1975-06-20; source msha-controller-operator-history
- **controller_controls_mine:** Nesbit William A Iii → Green Grove Mine; 1975-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nesbit William A Iii → Green Grove Coal Company; 1975-02-04 to 1975-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Far-Del Coal Co Inc & Intercontinental Coal Inc → Green Grove Mine; 1975-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vitale Louis → Green Grove Mine; 1975-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vitale Louis → Far-Del Coal Co Inc & Intercontinental Coal Inc; 1975-06-21 to current/open; source msha-controller-operator-history