# Relationship history for MSHA mine 4503685

Current hierarchy: **Brandon  Crabtree; Aaron  Crabtree → A & B Rock, Inc. → A & B Rock Pit**

- 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:** A & B Rock, Inc. → A & B Rock Pit; 2010-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brandon  Crabtree et al → A & B Rock Pit; 2010-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brandon  Crabtree et al → A & B Rock, Inc.; 2010-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aaron  Crabtree et al → A & B Rock, Inc.; 2010-09-22 to current/open; source msha-controller-operator-history