# Relationship history for MSHA mine 2401795

Current hierarchy: **Ray  Wertz; William J  Wertz → Wertz Sand & Gravel → WERTZ 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:** Neifert White Company → WERTZ SAND & GRAVEL; 1985-01-01 to 1991-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Neil  Moldenhauer → WERTZ SAND & GRAVEL; 1985-01-01 to 1991-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Neil  Moldenhauer → Neifert White Company; 1985-01-01 to 1991-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Wertz Sand & Gravel → WERTZ SAND & GRAVEL; 1991-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William J  Wertz et al → WERTZ SAND & GRAVEL; 1991-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William J  Wertz et al → Wertz Sand & Gravel; 1991-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray  Wertz et al → Wertz Sand & Gravel; 1991-07-01 to current/open; source msha-controller-operator-history