# Relationship history for MSHA mine 3102197

Current hierarchy: **Franklin W.  Eason → Matthew Sand & Gravel, Inc → Matthew Sand & Gravel, Inc.**

- 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:** Matthew Sand & Gravel, Inc → Matthew Sand & Gravel, Inc.; 2004-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Franklin W.  Eason → Matthew Sand & Gravel, Inc.; 2004-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Franklin W.  Eason → Matthew Sand & Gravel, Inc; 2004-06-21 to current/open; source msha-controller-operator-history