# Relationship history for MSHA mine 3003682

Current hierarchy: **David E  Parker → PARKER EXCAVATING & GRAVEL CO. INC. → 65-05-040 TURBO CHIEFTAIN**

- 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:** Parker Excavating & Gravel Co. Inc. → 65-05-040 TURBO CHIEFTAIN; 2009-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David E  Parker → 65-05-040 TURBO CHIEFTAIN; 2009-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David E  Parker → Parker Excavating & Gravel Co. Inc.; 2009-05-20 to current/open; source msha-controller-operator-history