# Relationship history for MSHA mine 3401011

Current hierarchy: **Carl Shirley → Shirley'S Sand Inc → Shirley'S Sand**

- 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

- **controller_controls_mine:** Hallett Construction Company → Shirley'S Sand; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shirley'S Sand Inc → Shirley'S Sand; 1950-01-01 to 1979-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Carl Shirley → Shirley'S Sand; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl Shirley → Shirley'S Sand Inc; 1950-01-01 to 1979-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Sooner Rock & Sand Company Inc → Shirley'S Sand; 1979-03-19 to 1984-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Hallett Construction Company → Sooner Rock & Sand Company Inc; 1979-03-19 to 1984-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Shirley'S Sand Inc → Shirley'S Sand; 1985-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl Shirley → Shirley'S Sand Inc; 1985-01-01 to current/open; source msha-controller-operator-history