# Relationship history for MSHA mine 0405320

Current hierarchy: **Jens  Karlshoej → Nordic Industries, Inc. → SPRING 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:** Axel  Karlshoej → SPRING VALLEY QUARRY; 1950-01-01 to 2012-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Carl J  Woods → SPRING VALLEY QUARRY; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carl J Woods Const. Co., Inc. → SPRING VALLEY QUARRY; 1997-07-01 to 2012-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Carl J  Woods → Carl J Woods Const. Co., Inc.; 1997-07-01 to 2012-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Nordic Industries, Inc. → SPRING VALLEY QUARRY; 2012-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jens  Karlshoej → SPRING VALLEY QUARRY; 2012-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jens  Karlshoej → Nordic Industries, Inc.; 2012-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Axel  Karlshoej → Nordic Industries, Inc.; 2012-10-09 to 2012-10-08; source msha-controller-operator-history