# Relationship history for MSHA mine 2103544

Current hierarchy: **Mark  Lee → Mark Lee Asphalt & Paving Inc. → 1800 Power Screener**

- 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:** Lakes Area Gravel Product → 1800 Power Screener; 2006-06-13 to 2007-06-05; source msha-controller-operator-history
- **controller_controls_mine:** LeRoy J Schnitzler → 1800 Power Screener; 2006-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** LeRoy J Schnitzler → Lakes Area Gravel Product; 2006-06-13 to 2007-06-05; source msha-controller-operator-history
- **operator_operates_mine:** Lakes Area Paving → 1800 Power Screener; 2007-06-06 to 2012-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Cheri L  Wood → 1800 Power Screener; 2007-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cheri L  Wood → Lakes Area Paving; 2007-06-06 to 2012-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Mark Lee Asphalt & Paving Inc. → 1800 Power Screener; 2012-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Lee → 1800 Power Screener; 2012-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Lee → Mark Lee Asphalt & Paving Inc.; 2012-04-18 to current/open; source msha-controller-operator-history