# Relationship history for MSHA mine 1512809

Current hierarchy: **Napier Daryl → Dawn Coal Corp → 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:** Woods Creek Corp → No 1; 1981-01-01 to 1988-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Chaney John → No 1; 1981-01-01 to 1988-02-07; source msha-controller-operator-history
- **controller_controls_operator:** Chaney John → Woods Creek Corp; 1981-01-01 to 1988-02-07; source msha-controller-operator-history
- **operator_operates_mine:** Dawn Coal Corp → No 1; 1988-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Napier Daryl → No 1; 1988-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Napier Daryl → Dawn Coal Corp; 1988-02-08 to current/open; source msha-controller-operator-history