# Relationship history for MSHA mine 4405913

Current hierarchy: **West James G → N O W Coal Company Inc → No 2**

- 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

- **controller_controls_mine:** Amvest Corporation → No 2; 1981-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Powell Mountain Coal Company Inc → No 2; 1982-06-01 to 1992-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Amvest Corporation → Powell Mountain Coal Company Inc; 1982-06-01 to 1992-12-09; source msha-controller-operator-history
- **controller_controls_mine:** West James G → No 2; 1987-12-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** N O W Coal Company Inc → No 2; 1992-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** West James G → N O W Coal Company Inc; 1992-12-10 to current/open; source msha-controller-operator-history