# Relationship history for MSHA mine 4402616

Current hierarchy: **Belcher Danny C → B & C Elkhorn Coal Co Inc → Surface Mine No 1**

- 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:** Rex Coal Co → Surface Mine No 1; 1950-01-01 to 1973-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Rex Coal Company → Surface Mine No 1; 1950-01-01 to 1973-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Rex Coal Company → Rex Coal Co; 1950-01-01 to 1973-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Cardinal Coal Co → Surface Mine No 1; 1973-11-16 to 1974-08-15; source msha-controller-operator-history
- **controller_controls_mine:** Cardinal Coal Company → Surface Mine No 1; 1973-11-16 to 1974-08-15; source msha-controller-operator-history
- **controller_controls_operator:** Cardinal Coal Company → Cardinal Coal Co; 1973-11-16 to 1974-08-15; source msha-controller-operator-history
- **operator_operates_mine:** B & C Elkhorn Coal Co Inc → Surface Mine No 1; 1974-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Belcher Danny C → Surface Mine No 1; 1974-08-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Belcher Danny C → B & C Elkhorn Coal Co Inc; 1974-08-16 to current/open; source msha-controller-operator-history