# Relationship history for MSHA mine 1518028

Current hierarchy: **Stanley R  Ditty → B R & D Enterprises Inc → Brd #3**

- 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:** B R & D Enterprises Inc → Brd #3; 1998-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stanley R  Ditty → Brd #3; 1998-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley R  Ditty → B R & D Enterprises Inc; 1998-03-01 to current/open; source msha-controller-operator-history