# Relationship history for MSHA mine 2402263

Current hierarchy: **Derek  Benefield → B & M Rock LLC → Grizzly**

- 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:** Grizzly Gravel Products → Grizzly; 2002-04-01 to 2007-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Michele  Glazier  et al → Grizzly; 2002-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michele  Glazier  et al → Grizzly Gravel Products; 2002-04-01 to 2007-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Glazier  et al → Grizzly Gravel Products; 2002-04-01 to 2007-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Grizzly Logging & Gravel Products Inc. → Grizzly; 2007-05-02 to 2026-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Glazier  et al → Grizzly; 2007-05-02 to 2026-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Glazier  et al → Grizzly Logging & Gravel Products Inc.; 2007-05-02 to 2026-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Michele  Glazier  et al → Grizzly Logging & Gravel Products Inc.; 2007-05-02 to 2026-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Derek  Benefield → Grizzly; 2026-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Derek  Benefield → Grizzly Logging & Gravel Products Inc.; 2026-04-09 to 2026-05-05; source msha-controller-operator-history
- **operator_operates_mine:** B & M Rock LLC → Grizzly; 2026-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Derek  Benefield → Grizzly; 2026-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Derek  Benefield → B & M Rock LLC; 2026-05-06 to current/open; source msha-controller-operator-history