# Relationship history for MSHA mine 3304276

Current hierarchy: **Icf International Inc → Icf Kaiser Engineers Inc → Octad Research Facility**

- 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:** Icf Kaiser Engineers Inc → Octad Research Facility; 1992-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Icf International Inc → Octad Research Facility; 1992-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Icf International Inc → Icf Kaiser Engineers Inc; 1992-06-01 to current/open; source msha-controller-operator-history