# Relationship history for MSHA mine 1700991

Current hierarchy: **Tim C  Francis; Chad R  Francis → Atlantic Landscape Construction, Inc → TC Gravel Pit**

- 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:** Atlantic Landscape Construction, Inc → TC Gravel Pit; 2017-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim C  Francis et al → TC Gravel Pit; 2017-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim C  Francis et al → Atlantic Landscape Construction, Inc; 2017-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad R  Francis et al → Atlantic Landscape Construction, Inc; 2017-03-03 to current/open; source msha-controller-operator-history