# Relationship history for MSHA mine 1101319

Current hierarchy: **Treco Sales Inc → Consolidated Zemi Corp → Serena Sand Plant-Zemi Corporation**

- 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:** Owens-Illinois Inc → Serena Sand Plant-Zemi Corporation; 1950-01-01 to 1980-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Owens Illinois Inc → Serena Sand Plant-Zemi Corporation; 1950-01-01 to 1984-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Owens Illinois Inc → Owens-Illinois Inc; 1950-01-01 to 1980-05-19; source msha-controller-operator-history
- **operator_operates_mine:** Consolidated Zemi Corp → Serena Sand Plant-Zemi Corporation; 1980-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Treco Sales Inc → Serena Sand Plant-Zemi Corporation; 1980-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Treco Sales Inc → Consolidated Zemi Corp; 1980-05-20 to current/open; source msha-controller-operator-history