# Relationship history for MSHA mine 2402271

Current hierarchy: **Larry K  Smith → Valley Excavating Sand & Gravel LLC → Valley Sand & Gravel (Portable)**

- 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:** Larry K  Smith → Valley Sand & Gravel (Portable); 1987-09-01 to 2008-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Valley Excavation, Sand & Gravel → Valley Sand & Gravel (Portable); 2002-03-29 to 2008-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Larry K  Smith → Valley Excavation, Sand & Gravel; 2002-03-29 to 2008-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Valley Excavating Sand & Gravel LLC → Valley Sand & Gravel (Portable); 2008-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry K  Smith → Valley Sand & Gravel (Portable); 2008-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry K  Smith → Valley Excavating Sand & Gravel LLC; 2008-04-01 to current/open; source msha-controller-operator-history