# Relationship history for MSHA mine 0800760

Current hierarchy: **Frank J  Colitz → Crystal River Quarries Inc → Maylen Mine**

- 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:** Frank J  Colitz → Maylen Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carroll Contracting & Ready-Mix Inc → Maylen Mine; 1950-01-01 to 1992-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Richard T  Carroll → Maylen Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard T  Carroll → Carroll Contracting & Ready-Mix Inc; 1950-01-01 to 1992-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Sunshine Materials Inc → Maylen Mine; 1992-07-01 to 1998-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Sunshine Materials Inc → Maylen Mine; 1992-07-01 to 1998-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Sunshine Materials Inc → Sunshine Materials Inc; 1992-07-01 to 1998-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Grubbs Construction Company → Maylen Mine; 1998-01-02 to 2004-04-18; source msha-controller-operator-history
- **controller_controls_mine:** John G  Grubbs → Maylen Mine; 1998-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John G  Grubbs → Grubbs Construction Company; 1998-01-02 to 2004-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Crystal River Quarries Inc → Maylen Mine; 2004-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank J  Colitz → Crystal River Quarries Inc; 2004-04-19 to current/open; source msha-controller-operator-history