# Relationship history for MSHA mine 3610174

Current hierarchy: **Andrew L  Bishop → Always Ready Crushed Stone, Inc. → Byers Quarry**

- 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:** Andrew  Bishop et al → Byers Quarry; 2013-12-05 to 2016-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Always Ready Crushed Stone, Inc. → Byers Quarry; 2016-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew  Bishop et al → Always Ready Crushed Stone, Inc.; 2016-03-15 to 2016-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Andrew L  Bishop → Byers Quarry; 2016-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew L  Bishop → Always Ready Crushed Stone, Inc.; 2016-05-02 to current/open; source msha-controller-operator-history