# Relationship history for MSHA mine 3609874

Current hierarchy: **Roger  Long → Long's Stone → Osgood Quarry**

- 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

- **controller_controls_mine:** Roger  Long → Osgood Quarry; 2009-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Long's Stone → Osgood Quarry; 2010-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Long → Long's Stone; 2010-08-20 to current/open; source msha-controller-operator-history