# Relationship history for MSHA mine 4202599

Current hierarchy: **Infrastructure and Energy Alternatives, Inc → William Charles Construction → UPRR Lakeside Quarry**

- 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

- **controller_controls_mine:** William Charles Ltd → UPRR Lakeside Quarry; 2009-03-01 to 2018-12-12; source msha-controller-operator-history
- **operator_operates_mine:** William Charles Construction → UPRR Lakeside Quarry; 2012-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William Charles Ltd → William Charles Construction; 2012-11-27 to 2018-12-12; source msha-controller-operator-history
- **controller_controls_mine:** Infrastructure and Energy Alternatives, Inc → UPRR Lakeside Quarry; 2018-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Infrastructure and Energy Alternatives, Inc → William Charles Construction; 2018-12-13 to current/open; source msha-controller-operator-history