# Relationship history for MSHA mine 4105010

Current hierarchy: **Robert E  Harrell → Bob Harrell Trucking → Hylton Aggregate**

- 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:** Keith  Debault → Hylton Aggregate; 1997-12-01 to 2025-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Harrell → Hylton Aggregate; 2007-08-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mine Service Inc. → Hylton Aggregate; 2013-04-10 to 2016-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Debault → Mine Service Inc.; 2013-04-10 to 2016-06-08; source msha-controller-operator-history
- **operator_operates_mine:** Bob Harrell Trucking → Hylton Aggregate; 2016-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Harrell → Bob Harrell Trucking; 2016-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael B  Debault → Hylton Aggregate; 2025-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael B  Debault → Mine Service Inc.; 2025-02-10 to 2016-06-08; source msha-controller-operator-history