# Relationship history for MSHA mine 0504961

Current hierarchy: **Ken  Buesing → Recycled Materials Company, Inc. → Portable Processing Equipment**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Recycled Materials Company, Inc. → Portable Processing Equipment; 2010-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ken  Buesing → Portable Processing Equipment; 2010-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ken  Buesing → Recycled Materials Company, Inc.; 2010-06-28 to current/open; source msha-controller-operator-history