# Relationship history for MSHA mine 4300343

Current hierarchy: **Putvain Robert L → Robert L Putvain Excavating → Robert L Putvain Excavating**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Willey'S Sand & Gravel → Robert L Putvain Excavating; 1980-05-01 to 1984-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Willey Lawrence Richard → Robert L Putvain Excavating; 1980-05-01 to 1984-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Willey Lawrence Richard → Willey'S Sand & Gravel; 1980-05-01 to 1984-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Robert L Putvain Excavating → Robert L Putvain Excavating; 1984-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Putvain Robert L → Robert L Putvain Excavating; 1984-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Putvain Robert L → Robert L Putvain Excavating; 1984-04-04 to current/open; source msha-controller-operator-history