# Relationship history for MSHA mine 3200850

Current hierarchy: **Bill  Trotter → TROTTER CONSTRUCTION INC → #710 TESAB CRUSHER**

- 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:** Bill  Trotter → #710 TESAB CRUSHER; 2002-08-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** TROTTER CONSTRUCTION INC → #710 TESAB CRUSHER; 2009-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Trotter → TROTTER CONSTRUCTION INC; 2009-05-13 to current/open; source msha-controller-operator-history