# Relationship history for MSHA mine 2402340

Current hierarchy: **EH Oftedal & Sons Inc → Oftedal Construction, Inc. → Oftedal Crusher #2**

- 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:** EH Oftedal & Sons Inc → Oftedal Crusher #2; 1995-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oftedal Construction, Inc. → Oftedal Crusher #2; 2003-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** EH Oftedal & Sons Inc → Oftedal Construction, Inc.; 2003-09-26 to current/open; source msha-controller-operator-history