# Relationship history for MSHA mine 2103121

Current hierarchy: **Dave W Reimer; Richard K Whinnery → Custom Crushing & Screening, Inc. → #2 Crusher**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Custom Crushing & Screening, Inc. → #2 Crusher; 1996-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William L Schuh → #2 Crusher; 1996-05-01 to 2004-02-08; source msha-controller-operator-history
- **controller_controls_operator:** William L Schuh → Custom Crushing & Screening, Inc.; 1996-05-01 to 2004-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Dave W Reimer et al → #2 Crusher; 2004-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave W Reimer et al → Custom Crushing & Screening, Inc.; 2004-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard K Whinnery et al → Custom Crushing & Screening, Inc.; 2004-02-09 to current/open; source msha-controller-operator-history