# Relationship history for MSHA mine 2501001

Current hierarchy: **Francis H  Gillen → Francis H Gillen Excavating → Francis H Gillen Pit #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Francis H Gillen Excavating → Francis H Gillen Pit #2; 1981-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Francis H  Gillen → Francis H Gillen Pit #2; 1981-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Francis H  Gillen → Francis H Gillen Excavating; 1981-07-01 to current/open; source msha-controller-operator-history