# Relationship history for MSHA mine 1200013

Current hierarchy: **Jason M  Knies; Joseph R  Knies; Craig J  Knies; Jason M  Knies; Joseph → Calcar Quarries Inc → Calcar Quarry**

- 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

- **operator_operates_mine:** Calcar Quarries Inc → Calcar Quarry; 1950-01-01 to 2008-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Jerry W  Meadows → Calcar Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry W  Meadows → Calcar Quarries Inc; 1950-01-01 to 2008-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Joseph R  Knies → Calcar Quarry; 1950-01-01 to 2019-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Calcar Quarries Inc → Calcar Quarry; 2008-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph R  Knies → Calcar Quarries Inc; 2008-05-01 to 2019-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Joseph R  Knies → Calcar Quarry; 2008-05-01 to 2019-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Joseph R  Knies → Calcar Quarries Inc; 2008-05-01 to 2019-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Craig J  Knies et al → Calcar Quarry; 2019-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig J  Knies et al → Calcar Quarries Inc; 2019-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph R  Knies et al → Calcar Quarries Inc; 2019-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason M  Knies et al → Calcar Quarries Inc; 2019-11-01 to current/open; source msha-controller-operator-history