# Relationship history for MSHA mine 0200973

Current hierarchy: **Oliver Clarence E Jr → Eagle Mountain Materials Inc → Summit Mine**

- 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:** Scoria Products Branch-Ultro Inc → Summit Mine; 1950-01-01 to 1979-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Harenburg Ray → Summit Mine; 1950-01-01 to 1979-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Harenburg Ray → Scoria Products Branch-Ultro Inc; 1950-01-01 to 1979-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Mountain Materials Inc → Summit Mine; 1979-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oliver Clarence E Jr → Summit Mine; 1979-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oliver Clarence E Jr → Eagle Mountain Materials Inc; 1979-07-17 to current/open; source msha-controller-operator-history