# Relationship history for MSHA mine 3603444

Current hierarchy: **Jeff  Nielsen → Berks Products Corp → Oley 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:** Berks Products Corp → Oley Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John R  Hannon → Oley Quarry; 1950-01-01 to 2014-04-13; source msha-controller-operator-history
- **controller_controls_operator:** John R  Hannon → Berks Products Corp; 1950-01-01 to 2014-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Nielsen → Oley Quarry; 2014-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Nielsen → Berks Products Corp; 2014-04-14 to current/open; source msha-controller-operator-history