# Relationship history for MSHA mine 0202667

Current hierarchy: **Peter Kiewit Sons' Inc → United Metro Materials Inc → VALENCIA PORTABLE #2 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:** Peter Kiewit Sons' Inc → VALENCIA PORTABLE #2 CRUSHER; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keith  Gallagher → VALENCIA PORTABLE #2 CRUSHER; 1950-01-01 to 2011-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Peter Kiewit Sons' Inc → VALENCIA PORTABLE #2 CRUSHER; 1989-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** San Xavier Rock & Materials → VALENCIA PORTABLE #2 CRUSHER; 1996-05-01 to 1996-08-20; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → San Xavier Rock & Materials; 1996-05-01 to 1996-08-20; source msha-controller-operator-history
- **operator_operates_mine:** Willcox Rock & Sand Inc → VALENCIA PORTABLE #2 CRUSHER; 1996-08-21 to 2000-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Gallagher → Willcox Rock & Sand Inc; 1996-08-21 to 2000-08-10; source msha-controller-operator-history
- **operator_operates_mine:** United Metro Materials Inc → VALENCIA PORTABLE #2 CRUSHER; 2000-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → United Metro Materials Inc; 2000-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shaye E  Klump et al → VALENCIA PORTABLE #2 CRUSHER; 2011-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shaye E  Klump et al → Willcox Rock & Sand Inc; 2011-08-29 to 2000-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Kelly L  Owen et al → Willcox Rock & Sand Inc; 2011-08-29 to 2000-08-10; source msha-controller-operator-history