# Relationship history for MSHA mine 1300338

Current hierarchy: **Roy  Harris; Kim  Harris → Harris & Sons Construction Company Inc → Can-Tex Industries-Grimes Plant-West 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Can-Tex Industries → Can-Tex Industries-Grimes Plant-West Pit; 1950-01-01 to 1978-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Harsco Corp → Can-Tex Industries-Grimes Plant-West Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harsco Corp → Can-Tex Industries; 1950-01-01 to 1978-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Kim  Harris et al → Can-Tex Industries-Grimes Plant-West Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harris & Sons Construction Company Inc → Can-Tex Industries-Grimes Plant-West Pit; 1978-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kim  Harris et al → Harris & Sons Construction Company Inc; 1978-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roy  Harris et al → Harris & Sons Construction Company Inc; 1978-12-05 to current/open; source msha-controller-operator-history