# Relationship history for MSHA mine 0202029

Current hierarchy: **Johnson Robert → Nicky Brite Mines Inc → Yankee Dollar Mine**

- 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:** Nicky Brite Mines Inc → Yankee Dollar Mine; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Robert → Yankee Dollar Mine; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Robert → Nicky Brite Mines Inc; 1981-01-01 to current/open; source msha-controller-operator-history