# Relationship history for MSHA mine 3003593

Current hierarchy: **Eric J  Dahlberg → ERIC J DAHLBERG CONT INC → MANORKILL GRAVEL MINE**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Eric J Dahlberg Cont Inc → MANORKILL GRAVEL MINE; 2007-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eric J  Dahlberg → MANORKILL GRAVEL MINE; 2007-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric J  Dahlberg → Eric J Dahlberg Cont Inc; 2007-05-16 to current/open; source msha-controller-operator-history