# Relationship history for MSHA mine 3606780

Current hierarchy: **Searights Processing Corp → Searights Operating Corp → Searights Project**

- 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:** Coal Washer Rental Corp → Searights Project; 1979-01-01 to 1979-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Weerts Ben → Searights Project; 1979-01-01 to 1979-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Weerts Ben → Coal Washer Rental Corp; 1979-01-01 to 1979-07-25; source msha-controller-operator-history
- **operator_operates_mine:** Searights Operating Corp → Searights Project; 1979-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Searights Processing Corp → Searights Project; 1979-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Searights Processing Corp → Searights Operating Corp; 1979-07-26 to current/open; source msha-controller-operator-history