# Relationship history for MSHA mine 4201668

Current hierarchy: **Stephen G  Bunn → Broken Arrow INC → Portable Mine**

- 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:** Sidney  Hullinger et al → Portable Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mc Farland & Hullinger → Portable Mine; 1980-03-01 to 2026-01-12; source msha-controller-operator-history
- **controller_controls_operator:** Sidney  Hullinger et al → Mc Farland & Hullinger; 1980-03-01 to 2026-01-12; source msha-controller-operator-history
- **controller_controls_operator:** Fayette  McFarland et al → Mc Farland & Hullinger; 1980-03-01 to 2026-01-12; source msha-controller-operator-history
- **controller_controls_mine:** Stephen G  Bunn → Portable Mine; 1994-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Broken Arrow INC → Portable Mine; 2026-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen G  Bunn → Broken Arrow INC; 2026-01-13 to current/open; source msha-controller-operator-history