# Relationship history for MSHA mine 1600908

Current hierarchy: **Richardson Sheila → Lee'S Dirt Pit Inc → Lee'S Dirt 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

- **operator_operates_mine:** Lee'S Truck Rental Inc → Lee'S Dirt Pit; 1950-01-01 to 1985-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Stirgus S Charles → Lee'S Dirt Pit; 1950-01-01 to 1985-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Stirgus S Charles → Lee'S Truck Rental Inc; 1950-01-01 to 1985-02-21; source msha-controller-operator-history
- **operator_operates_mine:** Lee'S Dirt Pit Inc → Lee'S Dirt Pit; 1985-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richardson Sheila → Lee'S Dirt Pit; 1985-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richardson Sheila → Lee'S Dirt Pit Inc; 1985-02-22 to current/open; source msha-controller-operator-history