# Relationship history for MSHA mine 4403864

Current hierarchy: **Willis R G → Dinosaur Development Company Inc → No 1 Strip**

- 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:** Dinosaur Development Company Inc → No 1 Strip; 1974-01-01 to 1976-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Gillespie James A → No 1 Strip; 1974-01-01 to 1976-01-16; source msha-controller-operator-history
- **controller_controls_operator:** Gillespie James A → Dinosaur Development Company Inc; 1974-01-01 to 1976-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Dinosaur Development Company Inc → No 1 Strip; 1976-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Willis R G → No 1 Strip; 1976-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Willis R G → Dinosaur Development Company Inc; 1976-01-17 to current/open; source msha-controller-operator-history