# Relationship history for MSHA mine 3401435

Current hierarchy: **Summit Materials LLC → Midwest Minerals Inc → Miami #31**

- 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:** George E  Nettels → Miami #31; 1950-01-01 to 2018-04-26; source msha-controller-operator-history
- **operator_operates_mine:** Midwest Minerals Inc → Miami #31; 1984-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George E  Nettels → Midwest Minerals Inc; 1984-02-01 to 2018-04-26; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Miami #31; 2018-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Midwest Minerals Inc; 2018-04-27 to current/open; source msha-controller-operator-history