# Relationship history for MSHA mine 2401762

Current hierarchy: **Ramaker James → Ramaker-Swanson Inc → RAMAKER PORTABLE CRUSHER**

- 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:** Ramaker-Swanson Inc → RAMAKER PORTABLE CRUSHER; 1984-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ramaker James → RAMAKER PORTABLE CRUSHER; 1984-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ramaker James → Ramaker-Swanson Inc; 1984-04-01 to current/open; source msha-controller-operator-history