# Relationship history for MSHA mine 3609702

Current hierarchy: **Gary W  Tedesco → TEDCO, INC. → MURPHY GFCC**

- 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

- **controller_controls_mine:** Gary W  Tedesco → MURPHY GFCC; 2008-06-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tedco, Inc. → MURPHY GFCC; 2009-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary W  Tedesco → Tedco, Inc.; 2009-01-30 to current/open; source msha-controller-operator-history