# Relationship history for MSHA mine 4703434

Current hierarchy: **Steven  Thelen → Thelen Sand & Gravel, Inc. → Lange Rd. Pit**

- 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:** Steven  Thelen → Lange Rd. Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thelen Sand & Gravel, Inc. → Lange Rd. Pit; 2005-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven  Thelen → Thelen Sand & Gravel, Inc.; 2005-09-01 to current/open; source msha-controller-operator-history