# Relationship history for MSHA mine 3606633

Current hierarchy: **Coleman Ronald → Wingrove Mining Inc → Crombie Strip**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Wingrove Mining Inc → Crombie Strip; 1978-03-01 to 1980-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Wingrove William E Et Al → Crombie Strip; 1978-03-01 to 1980-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Wingrove William E Et Al → Wingrove Mining Inc; 1978-03-01 to 1980-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Wingrove Mining Inc → Crombie Strip; 1980-03-18 to 1981-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Mowry W Thomas → Crombie Strip; 1980-03-18 to 1981-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Mowry W Thomas → Wingrove Mining Inc; 1980-03-18 to 1981-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Wingrove Mining Inc → Crombie Strip; 1981-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Ronald → Crombie Strip; 1981-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Ronald → Wingrove Mining Inc; 1981-09-15 to current/open; source msha-controller-operator-history