# Relationship history for MSHA mine 0202115

Current hierarchy: **Cyrus W  Spurlino → Silver State Materials Corp → Tee Pee Ready-Mix Incorporated**

- 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:** Tee Pee Ready-Mix Inc → Tee Pee Ready-Mix Incorporated; 1982-11-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Tate D A → Tee Pee Ready-Mix Incorporated; 1982-11-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Tate D A → Tee Pee Ready-Mix Inc; 1982-11-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Cyrus W  Spurlino → Tee Pee Ready-Mix Incorporated; 1990-02-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Silver State Materials Corp → Tee Pee Ready-Mix Incorporated; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyrus W  Spurlino → Silver State Materials Corp; 1991-04-01 to current/open; source msha-controller-operator-history