# Relationship history for MSHA mine 2602055

Current hierarchy: **Dorsa Robert → Ruby Dome Inc → Jones 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:** Ruby Dome Inc → Jones Pit; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dorsa Robert → Jones Pit; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dorsa Robert → Ruby Dome Inc; 1988-05-01 to current/open; source msha-controller-operator-history