# Relationship history for MSHA mine 1700723

Current hierarchy: **Lane Industries Inc → WARDWELL CONTRACTING (DIV. OF THE LANE CONST. CORP → PORTABLE PLANT #3 READ SCREEN**

- 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:** WARDWELL CONTRACTING-DIV./LANE CONST. CORP → PORTABLE PLANT #3 READ SCREEN; 2002-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lane Industries Inc → PORTABLE PLANT #3 READ SCREEN; 2002-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lane Industries Inc → WARDWELL CONTRACTING-DIV./LANE CONST. CORP; 2002-04-01 to current/open; source msha-controller-operator-history