# Relationship history for MSHA mine 2003168

Current hierarchy: **Eric J  Theut → Northern Aggregates LLC → Northern Aggregates LLC**

- 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:** Holmes Enterprises Inc → Northern Aggregates LLC; 2000-08-01 to 2003-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Douglas L  Schofield → Northern Aggregates LLC; 2000-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas L  Schofield → Holmes Enterprises Inc; 2000-08-01 to 2003-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Northern Aggregates LLC → Northern Aggregates LLC; 2003-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David E  Weber et al → Northern Aggregates LLC; 2003-05-01 to 2008-11-06; source msha-controller-operator-history
- **controller_controls_operator:** David E  Weber et al → Northern Aggregates LLC; 2003-05-01 to 2008-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Eric J  Theut et al → Northern Aggregates LLC; 2008-11-07 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Eric J  Theut et al → Northern Aggregates LLC; 2008-11-07 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_mine:** James A  Novak Jr → Northern Aggregates LLC; 2011-04-01 to 2011-09-16; source msha-controller-operator-history
- **controller_controls_operator:** James A  Novak Jr → Northern Aggregates LLC; 2011-04-01 to 2011-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Eric J  Theut et al → Northern Aggregates LLC; 2011-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric J  Theut et al → Northern Aggregates LLC; 2011-09-17 to current/open; source msha-controller-operator-history