# Relationship history for MSHA mine 1514272

Current hierarchy: **Matthew T  Woomer → Spartan Rock Products Inc → SPARTAN ROCK PRODUCTS INC**

- 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:** Speedco Inc → SPARTAN ROCK PRODUCTS INC; 1983-10-01 to 1988-10-17; source msha-controller-operator-history
- **controller_controls_mine:** William  Meade → SPARTAN ROCK PRODUCTS INC; 1983-10-01 to 1988-10-17; source msha-controller-operator-history
- **controller_controls_operator:** William  Meade → Speedco Inc; 1983-10-01 to 1988-10-17; source msha-controller-operator-history
- **operator_operates_mine:** Spartan Rock Products Inc → SPARTAN ROCK PRODUCTS INC; 1988-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Matthew T  Woomer → SPARTAN ROCK PRODUCTS INC; 1988-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew T  Woomer → Spartan Rock Products Inc; 1988-10-18 to current/open; source msha-controller-operator-history