# Relationship history for MSHA mine 1506321

Current hierarchy: **Nick A  Cooley → Wayne County Coal Corp → No 1 Surface**

- 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:** Sizemore Mining Corp → No 1 Surface; 1950-01-01 to 1976-08-09; source msha-controller-operator-history
- **controller_controls_mine:** Cooley Jack C → No 1 Surface; 1950-01-01 to 1976-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Cooley Jack C → Sizemore Mining Corp; 1950-01-01 to 1976-08-09; source msha-controller-operator-history
- **controller_controls_mine:** Nick A  Cooley et al → No 1 Surface; 1976-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wayne County Coal Corp → No 1 Surface; 1976-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick A  Cooley et al → Wayne County Coal Corp; 1976-08-10 to current/open; source msha-controller-operator-history