# Relationship history for MSHA mine 0503499

Current hierarchy: **Gerald W  Korinek → Korinek Sand & Gravel → Korinek Trout Farm Pit**

- 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:** Korinek Sand & Gravel → Korinek Trout Farm Pit; 1979-01-01 to 1986-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Fred L  Korinek → Korinek Trout Farm Pit; 1979-01-01 to 1986-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Fred L  Korinek → Korinek Sand & Gravel; 1979-01-01 to 1986-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Korinek Sand & Gravel → Korinek Trout Farm Pit; 1986-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gerald W  Korinek → Korinek Trout Farm Pit; 1986-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerald W  Korinek → Korinek Sand & Gravel; 1986-02-11 to current/open; source msha-controller-operator-history