# Relationship history for MSHA mine 4400289

Current hierarchy: **Browning Denver → General Trucking Corp → No 1 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Stamack Mining Company Limited → No 1 Strip; 1950-01-01 to 1972-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Womack Don R → No 1 Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Womack Don R → Stamack Mining Company Limited; 1950-01-01 to 1972-06-30; source msha-controller-operator-history
- **operator_operates_mine:** General Trucking Corp → No 1 Strip; 1972-07-01 to 1985-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Jessee Bill W → No 1 Strip; 1972-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jessee Bill W → General Trucking Corp; 1972-07-01 to 1985-07-30; source msha-controller-operator-history
- **operator_operates_mine:** General Trucking Corp → No 1 Strip; 1985-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Browning Denver → No 1 Strip; 1985-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Browning Denver → General Trucking Corp; 1985-07-31 to current/open; source msha-controller-operator-history