# Relationship history for MSHA mine 1518141

Current hierarchy: **Stanley R  Ditty → B R & D Enterprises Inc → Brd#4**

- 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:** Stanley R  Ditty → Brd#4; 1998-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B R & D Enterprises Inc → Brd#4; 1999-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley R  Ditty → B R & D Enterprises Inc; 1999-02-01 to current/open; source msha-controller-operator-history