# Relationship history for MSHA mine 4703632

Current hierarchy: **Leonard C  Longberg; Marilee G  Longberg → Rural Excavating Division of Harrison House LTD → Portable #1**

- 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:** Rural Excavating Division of Harrison House LTD → Portable #1; 2012-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marilee G  Longberg et al → Portable #1; 2012-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marilee G  Longberg et al → Rural Excavating Division of Harrison House LTD; 2012-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leonard C  Longberg et al → Rural Excavating Division of Harrison House LTD; 2012-01-04 to current/open; source msha-controller-operator-history