# Relationship history for MSHA mine 3901543

Current hierarchy: **Troy  Van Der Boom → BOOM CONCRETE INC → VANDERBOOM PIT**

- 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

- **operator_operates_mine:** Boom Concrete Inc → VANDERBOOM PIT; 2009-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Troy  Van Der Boom → VANDERBOOM PIT; 2009-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy  Van Der Boom → Boom Concrete Inc; 2009-07-08 to current/open; source msha-controller-operator-history