# Relationship history for MSHA mine 3003870

Current hierarchy: **Stanley M  Gridley Jr → Gridley Excavating LLC → Gridley River Rd Gravel Mine**

- 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:** Gridley Excavating LLC → Gridley River Rd Gravel Mine; 2013-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stanley M  Gridley Jr → Gridley River Rd Gravel Mine; 2013-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley M  Gridley Jr → Gridley Excavating LLC; 2013-03-04 to current/open; source msha-controller-operator-history