# Relationship history for MSHA mine 1800648

Current hierarchy: **Ginniman Charles F & Steven A → Ginniman Brothers Coal Company → Ginniman Brothers Surface**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Ginniman Brothers Coal Company → Ginniman Brothers Surface; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ginniman Charles F & Steven A → Ginniman Brothers Surface; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ginniman Charles F & Steven A → Ginniman Brothers Coal Company; 1977-08-01 to current/open; source msha-controller-operator-history