# Relationship history for MSHA mine 1506440

Current hierarchy: **Stivers Charles → Clay Coal Corp → No 13 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

- **operator_operates_mine:** Belles Fork Coal Co → No 13 Mine; 1950-01-01 to 1973-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Belles Fork Coal Co → No 13 Mine; 1950-01-01 to 1973-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Belles Fork Coal Co → Belles Fork Coal Co; 1950-01-01 to 1973-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Stivers Charles → No 13 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clay Coal Corp → No 13 Mine; 1973-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stivers Charles → Clay Coal Corp; 1973-11-14 to current/open; source msha-controller-operator-history