# Relationship history for MSHA mine 1510843

Current hierarchy: **C & J Mining & North Atlantic Salt & Mineral → C & J Mining Company → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** R C Coal Company Inc → No 1 Strip; 1977-10-01 to 1979-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Howard Daniel B → No 1 Strip; 1977-10-01 to 1979-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Howard Daniel B → R C Coal Company Inc; 1977-10-01 to 1979-01-28; source msha-controller-operator-history
- **operator_operates_mine:** C & J Mining Company → No 1 Strip; 1979-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** C & J Mining & North Atlantic Salt & Mineral → No 1 Strip; 1979-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C & J Mining & North Atlantic Salt & Mineral → C & J Mining Company; 1979-01-29 to current/open; source msha-controller-operator-history