# Relationship history for MSHA mine 4105200

Current hierarchy: **US Concrete → Ingram Concrete LLC → Renfroe Pit**

- 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:** US Concrete → Renfroe Pit; 2008-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tom Green Ready Mix, Inc. → Renfroe Pit; 2016-06-08 to 2016-09-12; source msha-controller-operator-history
- **controller_controls_mine:** Tommy  Wright et al → Renfroe Pit; 2016-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tommy  Wright et al → Tom Green Ready Mix, Inc.; 2016-06-08 to 2016-09-12; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Rezzlle et al → Tom Green Ready Mix, Inc.; 2016-06-08 to 2016-09-12; source msha-controller-operator-history
- **operator_operates_mine:** Ingram Concrete LLC → Renfroe Pit; 2016-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** US Concrete → Ingram Concrete LLC; 2016-09-13 to current/open; source msha-controller-operator-history