# Relationship history for MSHA mine 1901025

Current hierarchy: **Kibbe'S Gravel Pit → Kibbe'S Gravel Pit → Kibbe'S 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:** Kibbe'S Gravel Pit → Kibbe'S Pit; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kibbe'S Gravel Pit → Kibbe'S Pit; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kibbe'S Gravel Pit → Kibbe'S Gravel Pit; 1990-05-01 to current/open; source msha-controller-operator-history