# Relationship history for MSHA mine 2602770

Current hierarchy: **Marvin R  Rambo → Buck Mining Company → New Johnnie 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

- **operator_operates_mine:** Buck Mining Company → New Johnnie Mine; 2014-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marvin R  Rambo → New Johnnie Mine; 2014-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin R  Rambo → Buck Mining Company; 2014-10-15 to current/open; source msha-controller-operator-history