# Relationship history for MSHA mine 2601837

Current hierarchy: **Moore Duane → Green Ranch Mining Company → Frances 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

- **controller_controls_mine:** Moore Duane Et Al → Frances Mine; 1982-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Green Ranch Mining Company → Frances Mine; 1983-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moore Duane Et Al → Green Ranch Mining Company; 1983-04-22 to current/open; source msha-controller-operator-history