# Relationship history for MSHA mine 3606516

Current hierarchy: **Passieu Emma → Western Pennsylvania Aggregates Inc → Western Pa Aggregates Inc**

- 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:** Western Pennsylvania Aggregates Inc → Western Pa Aggregates Inc; 1950-01-01 to 1985-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Janaszek Francis B → Western Pa Aggregates Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Janaszek Francis B → Western Pennsylvania Aggregates Inc; 1950-01-01 to 1985-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Western Pennsylvania Aggregates Inc → Western Pa Aggregates Inc; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Passieu Emma → Western Pa Aggregates Inc; 1985-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Passieu Emma → Western Pennsylvania Aggregates Inc; 1985-07-01 to current/open; source msha-controller-operator-history