# Relationship history for MSHA mine 0501950

Current hierarchy: **Summit Materials LLC → Elam Construction Inc → Huffer Pit**

- 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:** Elam Construction Inc → Huffer Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Elam → Huffer Pit; 1950-01-01 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Elam → Elam Construction Inc; 1950-01-01 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Huffer Pit; 2011-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Elam Construction Inc; 2011-04-01 to current/open; source msha-controller-operator-history