# Relationship history for MSHA mine 4407344

Current hierarchy: **David  Rew → Mears Sand and Gravel LLC → William F Mears Sand and 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Mears Sand and Gravel LLC → William F Mears Sand and Gravel INC; 2015-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Rew → William F Mears Sand and Gravel INC; 2015-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Rew → Mears Sand and Gravel LLC; 2015-03-23 to current/open; source msha-controller-operator-history