# Relationship history for MSHA mine 1509859

Current hierarchy: **Adams Resources & Energy Inc → Plastics Universal Corp → No 3 Strip**

- 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:** Adams Resources & Energy Inc → No 3 Strip; 1976-05-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Plastics Universal Corp → No 3 Strip; 1976-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adams Resources & Energy Inc → Plastics Universal Corp; 1976-07-19 to current/open; source msha-controller-operator-history