# Relationship history for MSHA mine 2104093

Current hierarchy: **Amy J  Viita; Richard E  Viita → Viita's Excavating Inc → Viita**

- 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:** Viita's Excavating Inc → Viita; 2025-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard E  Viita et al → Viita; 2025-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Viita et al → Viita's Excavating Inc; 2025-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amy J  Viita et al → Viita's Excavating Inc; 2025-03-27 to current/open; source msha-controller-operator-history