# Relationship history for MSHA mine 2100583

Current hierarchy: **Ryan  Pronk; Alex  Pronk; Weston  Carr → Buffalo Ridge Concrete, Inc. → Pronk Pit And Mill**

- 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:** Pronk Ready Mix Inc. → Pronk Pit And Mill; 1950-01-01 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Terry A  Pronk et al → Pronk Pit And Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry A  Pronk et al → Pronk Ready Mix Inc.; 1950-01-01 to 2010-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Buffalo Ridge Concrete, Inc. → Pronk Pit And Mill; 2011-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Bornhott et al → Pronk Pit And Mill; 2011-01-01 to 2023-12-31; source msha-controller-operator-history
- **controller_controls_operator:** John  Bornhott et al → Buffalo Ridge Concrete, Inc.; 2011-01-01 to 2023-12-31; source msha-controller-operator-history
- **controller_controls_operator:** David L  Muelebroeck et al → Buffalo Ridge Concrete, Inc.; 2011-01-01 to 2023-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Ryan  Pronk et al → Pronk Pit And Mill; 2024-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan  Pronk et al → Buffalo Ridge Concrete, Inc.; 2024-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alex  Pronk et al → Buffalo Ridge Concrete, Inc.; 2024-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Weston  Carr et al → Buffalo Ridge Concrete, Inc.; 2024-01-01 to current/open; source msha-controller-operator-history