# Relationship history for MSHA mine 2801047

Current hierarchy: **Bruce  Feld → LIBERTY STONE & AGGREGATES-CLINTON QUARRY → LIBERTY STONE & AGGREGATES-CLINTON**

- 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:** LIBERTY STONE & AGGREGATES-CLINTON QUARRY → LIBERTY STONE & AGGREGATES-CLINTON; 2017-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Christopher  Cherchio et al → LIBERTY STONE & AGGREGATES-CLINTON; 2017-05-20 to 2026-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Christopher  Cherchio et al → LIBERTY STONE & AGGREGATES-CLINTON QUARRY; 2017-05-20 to 2026-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Michael A Schlaefer et al → LIBERTY STONE & AGGREGATES-CLINTON QUARRY; 2017-05-20 to 2026-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Feld et al → LIBERTY STONE & AGGREGATES-CLINTON QUARRY; 2017-05-20 to 2026-01-19; source msha-controller-operator-history
- **controller_controls_mine:** Bruce  Feld → LIBERTY STONE & AGGREGATES-CLINTON; 2026-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Feld → LIBERTY STONE & AGGREGATES-CLINTON QUARRY; 2026-01-20 to current/open; source msha-controller-operator-history