# Relationship history for MSHA mine 0401688

Current hierarchy: **John F  Shea → ACCP → Anderson Cottonwood Pit**

- 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:** Anderson Cottonwood Concrete Products Inc → Anderson Cottonwood Pit; 1950-01-01 to 1980-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Murphy John → Anderson Cottonwood Pit; 1950-01-01 to 1980-03-02; source msha-controller-operator-history
- **controller_controls_operator:** Murphy John → Anderson Cottonwood Concrete Products Inc; 1950-01-01 to 1980-03-02; source msha-controller-operator-history
- **operator_operates_mine:** ACCP → Anderson Cottonwood Pit; 1980-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John F  Shea → Anderson Cottonwood Pit; 1980-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John F  Shea → ACCP; 1980-03-03 to current/open; source msha-controller-operator-history