# Relationship history for MSHA mine 1102822

Current hierarchy: **Brown Laverne & Paul Lambrecht → Brown & Lambrecht Earthmovers Inc → Pit Run Sand & 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Brown & Lambrecht Earthmovers Inc → Pit Run Sand & Gravel; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brown Laverne & Paul Lambrecht Et Al → Pit Run Sand & Gravel; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brown Laverne & Paul Lambrecht Et Al → Brown & Lambrecht Earthmovers Inc; 1985-04-01 to current/open; source msha-controller-operator-history