# Relationship history for MSHA mine 3002662

Current hierarchy: **Robert L  Murphy → Eastern Sand & Gravel Inc → SMITH 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Dickinson Melvin → SMITH PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dickinson & Everdyke Inc → SMITH PIT; 1984-07-01 to 1989-02-20; source msha-controller-operator-history
- **controller_controls_operator:** Dickinson Melvin → Dickinson & Everdyke Inc; 1984-07-01 to 1989-02-20; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Sand & Gravel Inc → SMITH PIT; 1989-02-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert L  Murphy → SMITH PIT; 1989-02-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Murphy → Eastern Sand & Gravel Inc; 1989-02-21 to current/open; source msha-controller-operator-history