# Relationship history for MSHA mine 0203169

Current hierarchy: **John F  Wommer → US CRUSHING INC → 19th Avenue**

- 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:** John F  Wommer → 19th Avenue; 2007-03-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** US CRUSHING INC → 19th Avenue; 2007-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John F  Wommer → US CRUSHING INC; 2007-03-08 to current/open; source msha-controller-operator-history