# Relationship history for MSHA mine 3609927

Current hierarchy: **Robert Johnson Flagstone Inc → Stagecoach Transport & Crushing LLC → Newton 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:** Daniel R  Hawbaker  et al → Newton Quarry; 1983-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Glenn O. Hawbaker, Inc. → Newton Quarry; 2011-05-11 to 2025-07-30; source msha-controller-operator-history
- **controller_controls_operator:** Daniel R  Hawbaker  et al → Glenn O. Hawbaker, Inc.; 2011-05-11 to 2025-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert Johnson Flagstone Inc → Newton Quarry; 2025-02-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stagecoach Transport & Crushing LLC → Newton Quarry; 2025-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert Johnson Flagstone Inc → Stagecoach Transport & Crushing LLC; 2025-07-31 to current/open; source msha-controller-operator-history