# Relationship history for MSHA mine 2402321

Current hierarchy: **Tom  Roe → Tom Roe & Son Construction Inc → Roe Portable 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:** Tom  Roe et al → Roe Portable Crusher; 1990-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tom Roe & Son Construction Inc → Roe Portable Crusher; 2003-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Roe et al → Tom Roe & Son Construction Inc; 2003-04-02 to current/open; source msha-controller-operator-history