# Relationship history for MSHA mine 0404280

Current hierarchy: **Cathy R  Studebaker → Randall Sand & Gravel → Randall Sand & Gravel**

- 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:** Randall'S Sand & Gravel → Randall Sand & Gravel; 1978-12-01 to 1991-07-29; source msha-controller-operator-history
- **controller_controls_mine:** Stan  Randall → Randall Sand & Gravel; 1978-12-01 to 1991-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Stan  Randall → Randall'S Sand & Gravel; 1978-12-01 to 1991-07-29; source msha-controller-operator-history
- **operator_operates_mine:** Randall Sand & Gravel → Randall Sand & Gravel; 1991-07-30 to 2006-11-02; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Studebaker → Randall Sand & Gravel; 1991-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Studebaker → Randall Sand & Gravel; 1991-07-30 to 2006-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Randall Sand & Gravel → Randall Sand & Gravel; 2006-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cathy R  Studebaker → Randall Sand & Gravel; 2006-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cathy R  Studebaker → Randall Sand & Gravel; 2006-11-03 to current/open; source msha-controller-operator-history