# Relationship history for MSHA mine 1700968

Current hierarchy: **Charles S  O'Brien → O'BRIEN & SONS → O'BRIEN & SONS**

- 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:** O'Brien & Sons → O'BRIEN & SONS; 2015-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles S  O'Brien → O'BRIEN & SONS; 2015-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles S  O'Brien → O'Brien & Sons; 2015-10-21 to current/open; source msha-controller-operator-history