# Relationship history for MSHA mine 0504571

Current hierarchy: **CRH PLC → Oldcastle SW Group, Inc → PORTABLE PLANT #1**

- 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

- **operator_operates_mine:** D G Huskin Construction Company Inc → PORTABLE PLANT #1; 1996-02-01 to 2005-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Daniel G  Huskin → PORTABLE PLANT #1; 1996-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel G  Huskin → D G Huskin Construction Company Inc; 1996-02-01 to 2005-03-02; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → PORTABLE PLANT #1; 1998-01-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** APC SOUTHERN CONSTRUCTION → PORTABLE PLANT #1; 2005-03-03 to 2021-07-26; source msha-controller-operator-history
- **controller_controls_mine:** Jim M  Mac Donald  et al → PORTABLE PLANT #1; 2005-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim M  Mac Donald  et al → APC SOUTHERN CONSTRUCTION; 2005-03-03 to 2021-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Jeff W  Keller  et al → APC SOUTHERN CONSTRUCTION; 2005-03-03 to 2021-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle SW Group, Inc → PORTABLE PLANT #1; 2021-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle SW Group, Inc; 2021-07-27 to current/open; source msha-controller-operator-history