# Relationship history for MSHA mine 1201767

Current hierarchy: **Richard  Ness → Richard Ness Excavating & Trucking Inc → NESS'S PORTABLE PIT**

- 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:** Richard Ness Excavating & Trucking Inc → NESS'S PORTABLE PIT; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Ness → NESS'S PORTABLE PIT; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Ness → Richard Ness Excavating & Trucking Inc; 1980-01-01 to current/open; source msha-controller-operator-history