# Relationship history for MSHA mine 1700913

Current hierarchy: **Robert B  Wardwell → Wardwell Const. & Trucking Corp. → Telsmith Cone Crusher**

- 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:** Robert B  Wardwell → Telsmith Cone Crusher; 2004-05-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wardwell Const. & Trucking Corp. → Telsmith Cone Crusher; 2013-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert B  Wardwell → Wardwell Const. & Trucking Corp.; 2013-07-10 to current/open; source msha-controller-operator-history