# Relationship history for MSHA mine 3001287

Current hierarchy: **Peckham Industries Inc → E Tetz & Sons LLC → MONGAUP VALLEY 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:** Edward  Tetz Jr → MONGAUP VALLEY QUARRY; 1950-01-01 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Simenitzky Brothers Inc → MONGAUP VALLEY QUARRY; 1950-01-01 to 1988-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Peter  Simenitzky → MONGAUP VALLEY QUARRY; 1950-01-01 to 1988-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Peter  Simenitzky → Simenitzky Brothers Inc; 1950-01-01 to 1988-02-17; source msha-controller-operator-history
- **operator_operates_mine:** E Tetz & Sons LLC → MONGAUP VALLEY QUARRY; 1988-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Tetz Jr → E Tetz & Sons LLC; 1988-02-18 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Peckham Industries Inc → MONGAUP VALLEY QUARRY; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peckham Industries Inc → E Tetz & Sons LLC; 2023-06-01 to current/open; source msha-controller-operator-history