# Relationship history for MSHA mine 3605147

Current hierarchy: **Standard Slag Company → Standard Aggregates Inc → Laurel 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

- **controller_controls_mine:** Standard Slag Company → Laurel Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eidemiller Enterprises Inc → Laurel Quarry; 1950-01-01 to 1980-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Eidemiller Adam Inc → Laurel Quarry; 1950-01-01 to 1980-10-19; source msha-controller-operator-history
- **controller_controls_operator:** Eidemiller Adam Inc → Eidemiller Enterprises Inc; 1950-01-01 to 1980-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Vico Inc → Laurel Quarry; 1980-02-26 to 1984-10-18; source msha-controller-operator-history
- **controller_controls_mine:** Irey Frank Jr Inc → Laurel Quarry; 1980-02-26 to 1984-10-18; source msha-controller-operator-history
- **controller_controls_operator:** Irey Frank Jr Inc → Vico Inc; 1980-02-26 to 1984-10-18; source msha-controller-operator-history
- **operator_operates_mine:** Standard Aggregates Inc → Laurel Quarry; 1984-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Standard Slag Company → Standard Aggregates Inc; 1984-10-19 to current/open; source msha-controller-operator-history