# Relationship history for MSHA mine 3502867

Current hierarchy: **Lowder Jerry → Shamrock Crushing Inc → Ridge Runner Pit**

- 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:** Grant I  Sharp → Ridge Runner Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Grant I Sharp → Ridge Runner Pit; 1978-03-09 to 1981-05-06; source msha-controller-operator-history
- **controller_controls_operator:** Grant I  Sharp → Grant I Sharp; 1978-03-09 to 1981-05-06; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Crushing Inc → Ridge Runner Pit; 1981-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lowder Jerry → Ridge Runner Pit; 1981-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lowder Jerry → Shamrock Crushing Inc; 1981-05-07 to current/open; source msha-controller-operator-history