# Relationship history for MSHA mine 4105083

Current hierarchy: **Roger  Albert → CSA Materials, Inc. → T-Rex**

- 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

- **controller_controls_mine:** Jack  Albert  et al → T-Rex; 1950-01-01 to 2017-01-29; source msha-controller-operator-history
- **operator_operates_mine:** CSA Materials, Inc. → T-Rex; 2014-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Albert  et al → CSA Materials, Inc.; 2014-08-04 to 2017-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Roger  Albert → T-Rex; 2017-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Albert → CSA Materials, Inc.; 2017-01-30 to current/open; source msha-controller-operator-history