# Relationship history for MSHA mine 4604442

Current hierarchy: **Evans Douglas E Coal Company → Douglas E Evans Coal Company → No 1 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:** National Coals Limited → No 1 Mine; 1975-01-15 to 1975-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Malone J M → No 1 Mine; 1975-01-15 to 1975-03-07; source msha-controller-operator-history
- **controller_controls_operator:** Malone J M → National Coals Limited; 1975-01-15 to 1975-03-07; source msha-controller-operator-history
- **operator_operates_mine:** Douglas E Evans Coal Company → No 1 Mine; 1975-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Evans Douglas E Coal Company → No 1 Mine; 1975-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Evans Douglas E Coal Company → Douglas E Evans Coal Company; 1975-03-08 to current/open; source msha-controller-operator-history