# Relationship history for MSHA mine 1507140

Current hierarchy: **Adams Resources & Energy Inc → Plastics Universal Corp → No 1 Mine (Surface)**

- 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:** Plastics Universal Inc → No 1 Mine (Surface); 1974-03-01 to 1976-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Wells Roger Jr → No 1 Mine (Surface); 1974-03-01 to 1976-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Wells Roger Jr → Plastics Universal Inc; 1974-03-01 to 1976-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Plastics Universal Corp → No 1 Mine (Surface); 1976-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adams Resources & Energy Inc → No 1 Mine (Surface); 1976-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adams Resources & Energy Inc → Plastics Universal Corp; 1976-05-02 to current/open; source msha-controller-operator-history