# Relationship history for MSHA mine 3301564

Current hierarchy: **Brian K  Miller; David M  Miller → Miller'S Sand & Gravel, Inc. → MILLER'S SAND & GRAVEL, INC.**

- 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:** Miller'S Sand & Gravel Inc → MILLER'S SAND & GRAVEL, INC.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brian K  Miller et al → MILLER'S SAND & GRAVEL, INC.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian K  Miller et al → Miller'S Sand & Gravel Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M  Miller et al → Miller'S Sand & Gravel Inc; 1950-01-01 to current/open; source msha-controller-operator-history