# Relationship history for MSHA mine 4202545

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

- 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:** Stephen G  Bunn → Broken Arrow Portable; 1994-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Grantsville West Industrial Park LLC → Broken Arrow Portable; 2010-03-15 to 2024-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Bryan  Beyler et al → Broken Arrow Portable; 2010-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryan  Beyler et al → Grantsville West Industrial Park LLC; 2010-03-15 to 2024-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Darrell  Nielsen et al → Grantsville West Industrial Park LLC; 2010-03-15 to 2024-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Broken Arrow INC → Broken Arrow Portable; 2024-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen G  Bunn → Broken Arrow INC; 2024-08-05 to current/open; source msha-controller-operator-history