# Relationship history for MSHA mine 4103634

Current hierarchy: **Olmos Equipment Company Inc → Olmos Equipment Company Inc → Dos Rios 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:** Olmos Equipment Company Inc → Dos Rios Pit; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Olmos Equipment Company Inc → Dos Rios Pit; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Olmos Equipment Company Inc → Olmos Equipment Company Inc; 1990-10-01 to current/open; source msha-controller-operator-history