# Relationship history for MSHA mine 3402197

Current hierarchy: **Ricky M Crouch → M D Stone → San Bois**

- 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:** M D Stone → San Bois; 2019-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ricky M Crouch → San Bois; 2019-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricky M Crouch → M D Stone; 2019-08-12 to current/open; source msha-controller-operator-history