# Relationship history for MSHA mine 3400366

Current hierarchy: **John R  Kalka → Perkins Sand LLC → Perkins**

- 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:** Irwin Sand → Perkins; 1950-01-01 to 2000-01-12; source msha-controller-operator-history
- **controller_controls_mine:** Jim  Irwin → Perkins; 1950-01-01 to 2000-01-12; source msha-controller-operator-history
- **controller_controls_operator:** Jim  Irwin → Irwin Sand; 1950-01-01 to 2000-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Continental Concrete Company → Perkins; 2000-01-13 to 2008-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Jerry O  Holderread → Perkins; 2000-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry O  Holderread → Continental Concrete Company; 2000-01-13 to 2008-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Perkins Sand LLC → Perkins; 2008-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jim E  Kinder → Perkins; 2008-05-13 to 2010-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Jim E  Kinder → Perkins Sand LLC; 2008-05-13 to 2010-02-21; source msha-controller-operator-history
- **controller_controls_mine:** John R  Kalka → Perkins; 2010-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Kalka → Perkins Sand LLC; 2010-02-22 to current/open; source msha-controller-operator-history