# Relationship history for MSHA mine 3503549

Current hierarchy: **Mitchell  Grayson; Garrett  Queen → Robinson-Owen Heavy Construction → Cline Butte Aggregate**

- 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:** Steve Fox Construction → Cline Butte Aggregate; 2001-11-27 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Fox → Cline Butte Aggregate; 2001-11-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Fox → Steve Fox Construction; 2001-11-27 to 2003-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Robinson-Owen Heavy Construction → Cline Butte Aggregate; 2004-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael O  Owen → Cline Butte Aggregate; 2004-01-01 to 2025-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Michael O  Owen → Robinson-Owen Heavy Construction; 2004-01-01 to 2025-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Garrett  Queen et al → Cline Butte Aggregate; 2025-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Garrett  Queen et al → Robinson-Owen Heavy Construction; 2025-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mitchell  Grayson et al → Robinson-Owen Heavy Construction; 2025-05-01 to current/open; source msha-controller-operator-history