# Relationship history for MSHA mine 1001744

Current hierarchy: **Krouse Richard D → Valley Rock → Echo Group Ii**

- 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:** Krouse Richard D → Echo Group Ii; 1982-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Valley Rock → Echo Group Ii; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Krouse Richard D → Valley Rock; 1986-06-01 to current/open; source msha-controller-operator-history