# Relationship history for MSHA mine 3003915

Current hierarchy: **Jereme D  Lehmer → Preston Stone, LLC → Lehmer's Sand and 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Jereme D  Lehmer → Lehmer's Sand and Gravel; 2013-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Preston Stone, LLC → Lehmer's Sand and Gravel; 2014-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jereme D  Lehmer → Preston Stone, LLC; 2014-06-09 to current/open; source msha-controller-operator-history