# Relationship history for MSHA mine 1516735

Current hierarchy: **Brent  Coleman → R B M Enterprises Inc → No 2**

- 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:** Brent  Coleman et al → No 2; 1987-02-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R B M Enterprises Inc → No 2; 1989-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Coleman et al → R B M Enterprises Inc; 1989-10-01 to current/open; source msha-controller-operator-history