# Relationship history for MSHA mine 3200940

Current hierarchy: **Andy  Bednarik; William  Quig → Root Construction, Inc → Portable Metso 1213 Impactor**

- 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:** Susan  Graham → Portable Metso 1213 Impactor; 2011-12-09 to 2013-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Root Construction, Inc → Portable Metso 1213 Impactor; 2012-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Susan  Graham → Root Construction, Inc; 2012-03-26 to 2013-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Andy  Bednarik et al → Portable Metso 1213 Impactor; 2013-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andy  Bednarik et al → Root Construction, Inc; 2013-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Quig et al → Root Construction, Inc; 2013-02-01 to current/open; source msha-controller-operator-history