# Relationship history for MSHA mine 0402772

Current hierarchy: **Ray D  Kahle; Velma  Kahle → Fox'S Sand & Gravel → FOX'S SAND & GRAVEL**

- 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:** Foxes Sand & Gravel → FOX'S SAND & GRAVEL; 1950-01-01 to 1988-12-19; source msha-controller-operator-history
- **controller_controls_mine:** Robert D  Fox → FOX'S SAND & GRAVEL; 1950-01-01 to 1988-12-19; source msha-controller-operator-history
- **controller_controls_operator:** Robert D  Fox → Foxes Sand & Gravel; 1950-01-01 to 1988-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Fox'S Sand & Gravel → FOX'S SAND & GRAVEL; 1988-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Velma  Kahle  et al → FOX'S SAND & GRAVEL; 1988-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Velma  Kahle  et al → Fox'S Sand & Gravel; 1988-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray D  Kahle  et al → Fox'S Sand & Gravel; 1988-12-20 to current/open; source msha-controller-operator-history