# Relationship history for MSHA mine 2003043

Current hierarchy: **Conlon David & Douglass L Barr → Crushing Concepts Inc → TESABTCHIEF5036**

- 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:** Conlon David & Douglass L Barr → TESABTCHIEF5036; 1997-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crushing Concepts Inc → TESABTCHIEF5036; 1997-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Conlon David & Douglass L Barr → Crushing Concepts Inc; 1997-09-01 to current/open; source msha-controller-operator-history