# Relationship history for MSHA mine 0202019

Current hierarchy: **Richey L M-Don Adams → 85 Venture → Golden Wonder**

- 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:** 85 Venture → Golden Wonder; 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richey L M-Don Adams Et Al → Golden Wonder; 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richey L M-Don Adams Et Al → 85 Venture; 1980-11-01 to current/open; source msha-controller-operator-history