# Relationship history for MSHA mine 4602509

Current hierarchy: **Dotson Claude H → Calf Branch Coal Co Inc → Calf Branch No 1 Mine**

- 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:** Moore Coal Company → Calf Branch No 1 Mine; 1950-01-01 to 1974-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Moore Coal Co → Calf Branch No 1 Mine; 1950-01-01 to 1974-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Moore Coal Co → Moore Coal Company; 1950-01-01 to 1974-07-08; source msha-controller-operator-history
- **operator_operates_mine:** Calf Branch Coal Co Inc → Calf Branch No 1 Mine; 1974-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dotson Claude H → Calf Branch No 1 Mine; 1974-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dotson Claude H → Calf Branch Coal Co Inc; 1974-07-09 to current/open; source msha-controller-operator-history