# Relationship history for MSHA mine 3000296

Current hierarchy: **Isiklar Holding A S → Powell & Minnock Brick Works Inc → POWELL & MINNOCK PLANT AND GEDNE**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Powell & Minnock → POWELL & MINNOCK PLANT AND GEDNE; 1950-01-01 to 1994-05-08; source msha-controller-operator-history
- **controller_controls_mine:** General Dynamics Corp → POWELL & MINNOCK PLANT AND GEDNE; 1950-01-01 to 1994-05-08; source msha-controller-operator-history
- **controller_controls_operator:** General Dynamics Corp → Powell & Minnock; 1950-01-01 to 1994-05-08; source msha-controller-operator-history
- **operator_operates_mine:** Powell & Minnock Brick Works Inc → POWELL & MINNOCK PLANT AND GEDNE; 1994-05-09 to 1994-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → POWELL & MINNOCK PLANT AND GEDNE; 1994-05-09 to 1994-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Powell & Minnock Brick Works Inc; 1994-05-09 to 1994-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Powell & Minnock Brick Works Inc → POWELL & MINNOCK PLANT AND GEDNE; 1994-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Isiklar Holding A S → POWELL & MINNOCK PLANT AND GEDNE; 1994-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Isiklar Holding A S → Powell & Minnock Brick Works Inc; 1994-07-12 to current/open; source msha-controller-operator-history