# Relationship history for MSHA mine 0502366

Current hierarchy: **Summit Materials LLC → Peak Materials → Extec S-5 Track Mounted Screen sn9617**

- 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:** Harold  Elam → Extec S-5 Track Mounted Screen sn9617; 1950-01-01 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Everist → Extec S-5 Track Mounted Screen sn9617; 2002-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Everist Materials LLC → Extec S-5 Track Mounted Screen sn9617; 2003-06-13 to 2017-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Everist → Everist Materials LLC; 2003-06-13 to 2017-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Extec S-5 Track Mounted Screen sn9617; 2011-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peak Materials → Extec S-5 Track Mounted Screen sn9617; 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