# Relationship history for MSHA mine 2003519

Current hierarchy: **Michael L  Baker → Great Lakes Excavating 2.0,  LLC. → Great Lakes Excavating 2.0, LLC.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Great Lakes Excavating → Great Lakes Excavating 2.0, LLC.; 2015-10-10 to 2024-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Gary L Hough → Great Lakes Excavating 2.0, LLC.; 2015-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary L Hough → Great Lakes Excavating; 2015-10-10 to 2024-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Great Lakes Excavating 2.0  LLC → Great Lakes Excavating 2.0, LLC.; 2024-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael L  Baker → Great Lakes Excavating 2.0, LLC.; 2024-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael L  Baker → Great Lakes Excavating 2.0  LLC; 2024-06-01 to current/open; source msha-controller-operator-history