# Relationship history for MSHA mine 0102877

Current hierarchy: **Williams Jerry W → Apex Coal Corp → Warco #7**

- 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:** Williams Jerry W → Warco #7; 1986-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Apex Coal Corp → Warco #7; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams Jerry W → Apex Coal Corp; 1990-10-01 to current/open; source msha-controller-operator-history