# Relationship history for MSHA mine 2601754

Current hierarchy: **Zane John W & Robert G Williams → Wazco → Live Yankee**

- 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:** Wilson Mining Machinery → Live Yankee; 1981-07-01 to 1984-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Wilson Jesse R → Live Yankee; 1981-07-01 to 1984-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Jesse R → Wilson Mining Machinery; 1981-07-01 to 1984-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Wazco → Live Yankee; 1984-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zane John W & Robert G Williams → Live Yankee; 1984-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zane John W & Robert G Williams → Wazco; 1984-06-15 to current/open; source msha-controller-operator-history