# Relationship history for MSHA mine 4104507

Current hierarchy: **Michael B  Debault → Mine Service Inc. → Mine Service Pit #424**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Keith  Debault → Mine Service Pit #424; 1997-12-01 to 2025-02-09; source msha-controller-operator-history
- **operator_operates_mine:** 2-R Sand & Gravel, LP → Mine Service Pit #424; 2004-11-16 to 2005-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Jimmy  Callahan et al → Mine Service Pit #424; 2004-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy  Callahan et al → 2-R Sand & Gravel, LP; 2004-11-16 to 2005-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Debault et al → 2-R Sand & Gravel, LP; 2004-11-16 to 2005-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Mine Service Inc. → Mine Service Pit #424; 2005-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Debault → Mine Service Inc.; 2005-02-28 to 2025-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Michael B  Debault → Mine Service Pit #424; 2025-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael B  Debault → Mine Service Inc.; 2025-02-10 to current/open; source msha-controller-operator-history