# Relationship history for MSHA mine 4604215

Current hierarchy: **I L  Morris → Waco Stone → LYNWOOD QUARRY**

- 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:** Seneca Quarries Inc → LYNWOOD QUARRY; 1950-01-01 to 1996-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Fred  Burns Sr → LYNWOOD QUARRY; 1950-01-01 to 1996-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Burns Sr → Seneca Quarries Inc; 1950-01-01 to 1996-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Waco Stone → LYNWOOD QUARRY; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** I L  Morris → LYNWOOD QUARRY; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** I L  Morris → Waco Stone; 1997-01-01 to current/open; source msha-controller-operator-history