# Relationship history for MSHA mine 2200702

Current hierarchy: **Malcome  Draughn → Draughn Sand & Gravel Inc → Blue Lake 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:** Draughn Sand & Gravel Inc → Blue Lake Mine; 1998-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Malcome  Draughn → Blue Lake Mine; 1998-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Malcome  Draughn → Draughn Sand & Gravel Inc; 1998-03-01 to current/open; source msha-controller-operator-history