# Relationship history for MSHA mine 1901090

Current hierarchy: **William E  Lyons → W E LYONS SAND & GRAVEL INC → W E LYONS SAND & 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** W E Lyons Trucking Company Inc → W E LYONS SAND & GRAVEL INC; 2000-05-01 to 2004-04-04; source msha-controller-operator-history
- **controller_controls_mine:** William E  Lyons → W E LYONS SAND & GRAVEL INC; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William E  Lyons → W E Lyons Trucking Company Inc; 2000-05-01 to 2004-04-04; source msha-controller-operator-history
- **controller_controls_mine:** William E  Lyons → W E LYONS SAND & GRAVEL INC; 2003-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W E LYONS SAND & GRAVEL INC → W E LYONS SAND & GRAVEL INC; 2004-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William E  Lyons → W E LYONS SAND & GRAVEL INC; 2004-04-05 to current/open; source msha-controller-operator-history