# Relationship history for MSHA mine 1200039

Current hierarchy: **Daniel R  Balkema; Ralph T  Balkema → Bainbridge  Quarry LLC → Bainbridge Quarry LLC**

- 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:** Harris Stone Service Inc → Bainbridge Quarry LLC; 1950-01-01 to 2024-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth R  Davies et al → Bainbridge Quarry LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth R  Davies et al → Harris Stone Service Inc; 1950-01-01 to 2024-08-05; source msha-controller-operator-history
- **controller_controls_operator:** William H  Davies Jr et al → Harris Stone Service Inc; 1950-01-01 to 2024-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Bainbridge  Quarry LLC → Bainbridge Quarry LLC; 2024-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ralph T  Balkema et al → Bainbridge Quarry LLC; 2024-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph T  Balkema et al → Bainbridge  Quarry LLC; 2024-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel R  Balkema et al → Bainbridge  Quarry LLC; 2024-08-06 to current/open; source msha-controller-operator-history