# Relationship history for MSHA mine 3200906

Current hierarchy: **Bill  Trotter → TROTTER CONSTRUCTION INC → #1713 SANDVIK SCREEN PLANT**

- 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

- **controller_controls_mine:** Bill  Trotter → #1713 SANDVIK SCREEN PLANT; 2002-08-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** TROTTER CONSTRUCTION INC → #1713 SANDVIK SCREEN PLANT; 2011-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Trotter → TROTTER CONSTRUCTION INC; 2011-09-07 to current/open; source msha-controller-operator-history