# Relationship history for MSHA mine 0202297

Current hierarchy: **Earl D  Harrison; Laraine  Griesel → Harrison Mining → 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

- **controller_controls_mine:** Laraine  Griesel et al → Summit Mine; 1985-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harrison Mining → Summit Mine; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laraine  Griesel et al → Harrison Mining; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earl D  Harrison et al → Harrison Mining; 1986-03-01 to current/open; source msha-controller-operator-history