# Relationship history for MSHA mine 1601217

Current hierarchy: **Aubry L  Barber III; Lionel H  Barber → Barber Brothers Contracting Co LLC → Kent #2 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Lionel H  Barber  et al → Kent #2 Gravel Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Barber Brothers Contracting Co LLC → Kent #2 Gravel Pit; 1990-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lionel H  Barber  et al → Barber Brothers Contracting Co LLC; 1990-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aubry L  Barber III  et al → Barber Brothers Contracting Co LLC; 1990-12-01 to current/open; source msha-controller-operator-history