# Relationship history for MSHA mine 4607069

Current hierarchy: **Workman Mike → Workman Coal Inc → X W Inc #1 (Surface)**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Xw Corp → X W Inc #1 (Surface); 1986-02-01 to 1987-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Ray Timothy → X W Inc #1 (Surface); 1986-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray Timothy → Xw Corp; 1986-02-01 to 1987-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Workman Coal Inc → X W Inc #1 (Surface); 1987-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Workman Mike → X W Inc #1 (Surface); 1987-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Workman Mike → Workman Coal Inc; 1987-12-15 to current/open; source msha-controller-operator-history