# Relationship history for MSHA mine 1601314

Current hierarchy: **Ester  Penton → Penton Sand & Gravel → PENTON SAND & GRAVEL #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

- **controller_controls_mine:** Ester  Penton → PENTON SAND & GRAVEL #2; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Penton Sand & Gravel → PENTON SAND & GRAVEL #2; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ester  Penton → Penton Sand & Gravel; 1997-03-01 to current/open; source msha-controller-operator-history