# Relationship history for MSHA mine 3503657

Current hierarchy: **Ralph V.  Graven → Graven Enterprises, Inc. → Corning Pit**

- 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

- **operator_operates_mine:** Graven Enterprises, Inc. → Corning Pit; 2007-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ralph V.  Graven → Corning Pit; 2007-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ralph V.  Graven → Graven Enterprises, Inc.; 2007-01-11 to current/open; source msha-controller-operator-history