# Relationship history for MSHA mine 3500037

Current hierarchy: **John C  Bryant → J Arlie Bryant, Inc. → Portable Crushing**

- 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:** J Arlie Bryant, Inc. → Portable Crushing; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John C  Bryant → Portable Crushing; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John C  Bryant → J Arlie Bryant, Inc.; 1950-01-01 to current/open; source msha-controller-operator-history