# Relationship history for MSHA mine 3609869

Current hierarchy: **Nicholas J  Giammarino; Scott  DeWalt; Rick D  Watkins → Cheyenne Custom Bluestone → Quarry #1**

- 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:** Cheyenne Custom Bluestone → Quarry #1; 2011-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott  DeWalt et al → Quarry #1; 2011-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  DeWalt et al → Cheyenne Custom Bluestone; 2011-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick D  Watkins et al → Cheyenne Custom Bluestone; 2011-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas J  Giammarino et al → Cheyenne Custom Bluestone; 2011-04-11 to current/open; source msha-controller-operator-history