# Relationship history for MSHA mine 1800545

Current hierarchy: **Cowl Energy Corp → Union Coal Company → No 1 Strip**

- 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:** Rodamer Coal Company → No 1 Strip; 1974-10-14 to 1977-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Rodamer Clarence → No 1 Strip; 1974-10-14 to 1977-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Rodamer Clarence → Rodamer Coal Company; 1974-10-14 to 1977-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Cowl Energy Corp → No 1 Strip; 1977-07-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Union Coal Company → No 1 Strip; 1977-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cowl Energy Corp → Union Coal Company; 1977-07-20 to current/open; source msha-controller-operator-history