# Relationship history for MSHA mine 3003606

Current hierarchy: **Clinton C Morse → M & R Sand & Gravel → M&R Sand & Gravel**

- 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:** M & R Sand & Gravel → M&R Sand & Gravel; 2007-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clinton C Morse → M&R Sand & Gravel; 2007-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clinton C Morse → M & R Sand & Gravel; 2007-09-04 to current/open; source msha-controller-operator-history