# Relationship history for MSHA mine 0203057

Current hierarchy: **Ronald W  Nickel → Bell Ranch Quarry, Inc. → Bell Ranch Quarry, Inc.**

- 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:** Ronald W  Nickel → Bell Ranch Quarry, Inc.; 1999-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bell Ranch Quarry, Inc. → Bell Ranch Quarry, Inc.; 2004-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald W  Nickel → Bell Ranch Quarry, Inc.; 2004-07-23 to current/open; source msha-controller-operator-history