# Relationship history for MSHA mine 2902241

Current hierarchy: **Roger  Humphrey → Humphrey Sand, Gravel & Redi Mix, Inc. → Cuchillo Creek Mine**

- 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  Humphrey → Cuchillo Creek Mine; 1997-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Humphrey Sand, Gravel & Redi Mix, Inc. → Cuchillo Creek Mine; 2002-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Humphrey → Humphrey Sand, Gravel & Redi Mix, Inc.; 2002-10-28 to current/open; source msha-controller-operator-history