# Relationship history for MSHA mine 4405669

Current hierarchy: **Barnette Charles R → Wassa Mining Inc → Mine #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

- **controller_controls_mine:** Amvest Corporation → Mine #1; 1981-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Powell Mountain Coal Company Inc → Mine #1; 1981-06-01 to 1984-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Amvest Corporation → Powell Mountain Coal Company Inc; 1981-06-01 to 1984-11-29; source msha-controller-operator-history
- **operator_operates_mine:** Wassa Mining Inc → Mine #1; 1984-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barnette Charles R Et Al → Mine #1; 1984-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barnette Charles R Et Al → Wassa Mining Inc; 1984-11-30 to current/open; source msha-controller-operator-history