# Relationship history for MSHA mine 4102920

Current hierarchy: **Gunn R H → R H Gunn Mine Development → E Labus Mine**

- 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:** R H Gunn Mine Development → E Labus Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gunn R H → E Labus Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gunn R H → R H Gunn Mine Development; 1979-01-01 to current/open; source msha-controller-operator-history