# Relationship history for MSHA mine 2700569

Current hierarchy: **Amy J  Lawrence; Bruce A  Lawrence → Lawrence Sand and Gravel LLC → Lawrence Sand and Gravel LLC**

- 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:** Lawrence Sand and Gravel LLC → Lawrence Sand and Gravel LLC; 2025-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amy J  Lawrence et al → Lawrence Sand and Gravel LLC; 2025-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amy J  Lawrence et al → Lawrence Sand and Gravel LLC; 2025-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce A  Lawrence et al → Lawrence Sand and Gravel LLC; 2025-07-10 to current/open; source msha-controller-operator-history