# Relationship history for MSHA mine 2103868

Current hierarchy: **Gene  Arnt; David  Schifsky; Thomas  Schifsky → Crushers, Inc. → BTG Property Co., LLC**

- 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:** Crushers, Inc. → BTG Property Co., LLC; 2015-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Schifsky et al → BTG Property Co., LLC; 2015-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Schifsky et al → Crushers, Inc.; 2015-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Schifsky et al → Crushers, Inc.; 2015-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gene  Arnt et al → Crushers, Inc.; 2015-10-26 to current/open; source msha-controller-operator-history