# Relationship history for MSHA mine 3000800

Current hierarchy: **Peckham Industries Inc → E. Tetz & Sons LLC → CHESTER PLANT**

- 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 → CHESTER PLANT; 1950-01-01 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** A W Hollenbeck Inc → CHESTER PLANT; 1950-01-01 to 1984-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Hollenbeck David → CHESTER PLANT; 1950-01-01 to 1984-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Hollenbeck David → A W Hollenbeck Inc; 1950-01-01 to 1984-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Edward  Tetz Jr → CHESTER PLANT; 1979-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Slate Hill Sand & Gravel Inc → CHESTER PLANT; 1984-08-08 to 2012-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Tetz Jr → Slate Hill Sand & Gravel Inc; 1984-08-08 to 2012-03-06; source msha-controller-operator-history
- **operator_operates_mine:** E. Tetz & Sons LLC → CHESTER PLANT; 2012-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Tetz Jr → E. Tetz & Sons LLC; 2012-03-07 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Peckham Industries Inc → CHESTER PLANT; 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