# Relationship history for MSHA mine 3605971

Current hierarchy: **Carroll Coal Company Inc → Paul C Harman Company Inc → Carroll Strips No 3**

- 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:** White Coal Company → Carroll Strips No 3; 1976-03-01 to 1977-02-16; source msha-controller-operator-history
- **controller_controls_mine:** White Harris H → Carroll Strips No 3; 1976-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** White Harris H → White Coal Company; 1976-03-01 to 1977-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Paul C Harman Company Inc → Carroll Strips No 3; 1977-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carroll Coal Company Inc → Carroll Strips No 3; 1977-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carroll Coal Company Inc → Paul C Harman Company Inc; 1977-02-17 to current/open; source msha-controller-operator-history