# Relationship history for MSHA mine 3502940

Current hierarchy: **Walter J  Nelson → Hi-Land Construction Inc → Juniper Canyon Quarry**

- 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:** Hi-Land Construction Inc → Juniper Canyon Quarry; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walter J  Nelson → Juniper Canyon Quarry; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter J  Nelson → Hi-Land Construction Inc; 1979-01-01 to current/open; source msha-controller-operator-history