# Relationship history for MSHA mine 1508181

Current hierarchy: **Dotson Claude H → Calf Branch Coal Co Inc → No 2 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Dotson Claude H → No 2 Mine; 1974-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Beverly Bernie & Rodney Van Meter → No 2 Mine; 1974-11-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Left Fork Coal Co → No 2 Mine; 1975-03-28 to 1975-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Beverly Bernie & Rodney Van Meter → Left Fork Coal Co; 1975-03-28 to 1975-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Calf Branch Coal Co Inc → No 2 Mine; 1975-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dotson Claude H → Calf Branch Coal Co Inc; 1975-12-01 to current/open; source msha-controller-operator-history