# Relationship history for MSHA mine 4402344

Current hierarchy: **Double R Coal Co → Double R Coal Company → No 2 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:** Counts Hollow Coal Company → No 2 Strip; 1950-01-01 to 1973-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Counts Hollow Coal Co → No 2 Strip; 1950-01-01 to 1973-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Counts Hollow Coal Co → Counts Hollow Coal Company; 1950-01-01 to 1973-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Hickory Gap Coal Company → No 2 Strip; 1973-12-01 to 1974-11-18; source msha-controller-operator-history
- **controller_controls_mine:** Hickory Gap Coal Co → No 2 Strip; 1973-12-01 to 1974-11-18; source msha-controller-operator-history
- **controller_controls_operator:** Hickory Gap Coal Co → Hickory Gap Coal Company; 1973-12-01 to 1974-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Double R Coal Company → No 2 Strip; 1974-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Double R Coal Co → No 2 Strip; 1974-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Double R Coal Co → Double R Coal Company; 1974-11-19 to current/open; source msha-controller-operator-history