# Relationship history for MSHA mine 1519887

Current hierarchy: **Roger D  Meuth; John Delbert  Meuth → Audubon Sand & Gravel LLC → Audubon 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:** Audubon Sand & Gravel LLC → Audubon Sand & Gravel; 2020-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roger D  Meuth et al → Audubon Sand & Gravel; 2020-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger D  Meuth et al → Audubon Sand & Gravel LLC; 2020-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Delbert  Meuth et al → Audubon Sand & Gravel LLC; 2020-09-02 to current/open; source msha-controller-operator-history