# Relationship history for MSHA mine 0504761

Current hierarchy: **Juliet A  Moores → Elk Creek Sand & Gravel LLC → Shaffers Crossing 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

- **operator_operates_mine:** Elk Creek Sand & Gravel LLC → Shaffers Crossing Quarry; 2003-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Juliet A  Moores → Shaffers Crossing Quarry; 2003-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Juliet A  Moores → Elk Creek Sand & Gravel LLC; 2003-04-25 to current/open; source msha-controller-operator-history