# Relationship history for MSHA mine 0300566

Current hierarchy: **Summit Materials LLC → RazorRock Materials → Jonesboro Plant 675**

- 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:** St Francis Material Company → Jonesboro Plant 675; 1950-01-01 to 1987-07-17; source msha-controller-operator-history
- **controller_controls_mine:** Ben M Hogan Company Inc → Jonesboro Plant 675; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ben M Hogan Company Inc → St Francis Material Company; 1950-01-01 to 1987-07-17; source msha-controller-operator-history
- **controller_controls_mine:** William  Boorhem  et al → Jonesboro Plant 675; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** W Kent  Ingram → Jonesboro Plant 675; 1986-01-01 to 2017-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Boorhem-Fields Inc → Jonesboro Plant 675; 1987-07-18 to 1992-02-16; source msha-controller-operator-history
- **controller_controls_operator:** William  Boorhem  et al → Boorhem-Fields Inc; 1987-07-18 to 1992-02-16; source msha-controller-operator-history
- **operator_operates_mine:** RazorRock Materials → Jonesboro Plant 675; 1992-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W Kent  Ingram → RazorRock Materials; 1992-02-17 to 2017-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Jonesboro Plant 675; 2017-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → RazorRock Materials; 2017-02-27 to current/open; source msha-controller-operator-history