# Relationship history for MSHA mine 1516866

Current hierarchy: **Edward L Clemons Estate → Locust Grove Inc → No 4 Surface**

- 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

- **controller_controls_mine:** Edward L Clemons Estate → No 4 Surface; 1984-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Collett Vernon Et Al → No 4 Surface; 1989-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J P D Mining → No 4 Surface; 1990-04-01 to 1991-03-12; source msha-controller-operator-history
- **controller_controls_operator:** Collett Vernon Et Al → J P D Mining; 1990-04-01 to 1991-03-12; source msha-controller-operator-history
- **operator_operates_mine:** Locust Grove Inc → No 4 Surface; 1991-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward L Clemons Estate → Locust Grove Inc; 1991-03-13 to current/open; source msha-controller-operator-history