# Relationship history for MSHA mine 4404207

Current hierarchy: **J & C Mining Corp → R & D Enterprises Inc → No 1 Dock**

- 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:** Artie Coal Sales Inc → No 1 Dock; 1975-11-04 to 1978-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Rogers Odell → No 1 Dock; 1975-11-04 to 1978-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Odell → Artie Coal Sales Inc; 1975-11-04 to 1978-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Double A Coal Company Inc → No 1 Dock; 1978-02-16 to 1978-09-28; source msha-controller-operator-history
- **controller_controls_mine:** Double A Coal Company Inc → No 1 Dock; 1978-02-16 to 1978-09-28; source msha-controller-operator-history
- **controller_controls_operator:** Double A Coal Company Inc → Double A Coal Company Inc; 1978-02-16 to 1978-09-28; source msha-controller-operator-history
- **operator_operates_mine:** R & D Enterprises Inc → No 1 Dock; 1978-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** J & C Mining Corp → No 1 Dock; 1978-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J & C Mining Corp → R & D Enterprises Inc; 1978-09-29 to current/open; source msha-controller-operator-history