# Relationship history for MSHA mine 2002985

Current hierarchy: **Tom  Quigley; David  Brown → Minerals Processing Corp → ROPES MILL**

- 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:** Minerals Processing Corp → ROPES MILL; 1996-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Quigley et al → ROPES MILL; 1996-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Quigley et al → Minerals Processing Corp; 1996-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Brown et al → Minerals Processing Corp; 1996-06-01 to current/open; source msha-controller-operator-history