# Relationship history for MSHA mine 1700786

Current hierarchy: **Richard A  Tibbetts → R A Tibbetts → R A Tibbetts Portable**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** R A Tibbetts → R A Tibbetts Portable; 2005-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard A  Tibbetts → R A Tibbetts Portable; 2005-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard A  Tibbetts → R A Tibbetts; 2005-10-12 to current/open; source msha-controller-operator-history