# Relationship history for MSHA mine 0504872

Current hierarchy: **Summit Materials LLC → Peak Materials → Metso LT106 Track Mounted Jaw 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Harold  Elam → Metso LT106 Track Mounted Jaw Crusher; 1950-01-01 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Everist → Metso LT106 Track Mounted Jaw Crusher; 2002-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Everist Materials LLC → Metso LT106 Track Mounted Jaw Crusher; 2007-06-25 to 2017-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Everist → Everist Materials LLC; 2007-06-25 to 2017-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Metso LT106 Track Mounted Jaw Crusher; 2011-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peak Materials → Metso LT106 Track Mounted Jaw Crusher; 2017-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Elam → Peak Materials; 2017-04-01 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Peak Materials; 2017-04-01 to current/open; source msha-controller-operator-history