# Relationship history for MSHA mine 1517503

Current hierarchy: **Amon L  Mahon → Island Fork Construction Ltd → 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; 1994-02-01 to 1995-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Coleman et al → R B M Enterprises Inc; 1994-02-01 to 1995-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Amon L  Mahon → No 2; 1994-11-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Island Fork Construction Ltd → No 2; 1995-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amon L  Mahon → Island Fork Construction Ltd; 1995-10-25 to current/open; source msha-controller-operator-history