# Relationship history for MSHA mine 4104457

Current hierarchy: **Jimmy R  Griffin → Romayor Sand Gravel & Materials, Inc. → Romayor Sand Gravel  & Materials, Inc.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Romayor Sand Gravel & Materials, Inc. → Romayor Sand Gravel  & Materials, Inc.; 2004-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jimmy R  Griffin → Romayor Sand Gravel  & Materials, Inc.; 2004-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy R  Griffin → Romayor Sand Gravel & Materials, Inc.; 2004-01-27 to current/open; source msha-controller-operator-history