# Relationship history for MSHA mine 4104486

Current hierarchy: **Roger  Crouch → Crouch Sand & Gravel, Inc. → 1886**

- 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:** Roger  Crouch et al → 1886; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crouch Sand & Gravel, Inc. → 1886; 2004-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Crouch et al → Crouch Sand & Gravel, Inc.; 2004-09-14 to current/open; source msha-controller-operator-history