# Relationship history for MSHA mine 1102692

Current hierarchy: **Lambert Bruce → Woosung Quarry Products → WOOSUNG QUARRY PORTABLE**

- 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:** Jeff  Kemper → WOOSUNG QUARRY PORTABLE; 1950-01-01 to 1983-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Kehobe Materials Inc → WOOSUNG QUARRY PORTABLE; 1979-01-01 to 1983-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Kemper → Kehobe Materials Inc; 1979-01-01 to 1983-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Woosung Quarry Products → WOOSUNG QUARRY PORTABLE; 1983-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lambert Bruce → WOOSUNG QUARRY PORTABLE; 1983-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lambert Bruce → Woosung Quarry Products; 1983-05-12 to current/open; source msha-controller-operator-history