# Relationship history for MSHA mine 5001302

Current hierarchy: **Donald M  March → Wilder Construction Company → Chugiak 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:** Mapco Inc → Chugiak Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald M  March et al → Chugiak Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rogers & Babler → Chugiak Pit; 1979-01-01 to 1985-09-19; source msha-controller-operator-history
- **controller_controls_operator:** Mapco Inc → Rogers & Babler; 1979-01-01 to 1985-09-19; source msha-controller-operator-history
- **controller_controls_mine:** Phil  Godfrey et al → Chugiak Pit; 1985-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rogers & Babler → Chugiak Pit; 1985-09-20 to 1987-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Phil  Godfrey et al → Rogers & Babler; 1985-09-20 to 1987-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Barclay  Tollefson et al → Rogers & Babler; 1985-09-20 to 1987-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Wilder Construction Company → Chugiak Pit; 1987-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald M  March et al → Wilder Construction Company; 1987-08-28 to current/open; source msha-controller-operator-history