# Relationship history for MSHA mine 4604503

Current hierarchy: **Roy L  McCoy → Extractors Inc → No 1 Deep**

- 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

- **controller_controls_mine:** Cartwright George E → No 1 Deep; 1974-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Extractors Inc → No 1 Deep; 1975-01-20 to 1977-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Cartwright George E → Extractors Inc; 1975-01-20 to 1977-11-17; source msha-controller-operator-history
- **operator_operates_mine:** Extractors Inc → No 1 Deep; 1977-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roy L  McCoy et al → No 1 Deep; 1977-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy L  McCoy et al → Extractors Inc; 1977-11-18 to current/open; source msha-controller-operator-history