# Relationship history for MSHA mine 2102981

Current hierarchy: **Brad  Haugen → Crushing Unlimited, Inc. → Universal Crusher**

- 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:** H/D Goebel Inc → Universal Crusher; 1988-09-01 to 1994-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Goebel → Universal Crusher; 1988-09-01 to 1994-05-03; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Goebel → H/D Goebel Inc; 1988-09-01 to 1994-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Crushing Unlimited, Inc. → Universal Crusher; 1994-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brad  Haugen  et al → Universal Crusher; 1994-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Haugen  et al → Crushing Unlimited, Inc.; 1994-05-04 to current/open; source msha-controller-operator-history