# Relationship history for MSHA mine 1002146

Current hierarchy: **Summit Materials LLC → Triple C Concrete → Portable-JCI 6203 Track Screen**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Harold  Elam → Portable-JCI 6203 Track Screen; 1950-01-01 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_mine:** David C  Coats → Portable-JCI 6203 Track Screen; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triple C Concrete → Portable-JCI 6203 Track Screen; 2007-12-19 to 2011-01-14; source msha-controller-operator-history
- **controller_controls_operator:** David C  Coats → Triple C Concrete; 2007-12-19 to 2011-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Triple C Concrete → Portable-JCI 6203 Track Screen; 2011-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Elam → Triple C Concrete; 2011-01-15 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Portable-JCI 6203 Track Screen; 2011-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Triple C Concrete; 2011-04-01 to current/open; source msha-controller-operator-history