# Relationship history for MSHA mine 2402086

Current hierarchy: **Arthur Larry; Larry  Arthur → Arg Sand & Gravel Inc → GARDNER 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Arg Sand & Gravel Inc → GARDNER PORTABLE; 1996-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Arthur → GARDNER PORTABLE; 1996-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Arthur → Arg Sand & Gravel Inc; 1996-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur Larry → Arg Sand & Gravel Inc; 1996-03-01 to current/open; source msha-controller-operator-history