# Relationship history for MSHA mine 1302466

Current hierarchy: **Nathan  Graham; Preston  Graham → Precision Spreading LLC → Precision 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Precision Spreading LLC → Precision Gravel; 2017-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nathan  Graham et al → Precision Gravel; 2017-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nathan  Graham et al → Precision Spreading LLC; 2017-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Preston  Graham et al → Precision Spreading LLC; 2017-07-07 to current/open; source msha-controller-operator-history