# Relationship history for MSHA mine 3603162

Current hierarchy: **Troy  Adzima → Lakeland Aggregates, Inc. → Lakeland Aggregates**

- 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:** Conneaut Lake Sand & Gravel Inc → Lakeland Aggregates; 1950-01-01 to 1981-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Penn Grove Enterprises Inc → Lakeland Aggregates; 1950-01-01 to 1981-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Penn Grove Enterprises Inc → Conneaut Lake Sand & Gravel Inc; 1950-01-01 to 1981-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Conneaut Lake Sand & Gravel Inc → Lakeland Aggregates; 1981-04-01 to 2014-05-12; source msha-controller-operator-history
- **controller_controls_mine:** George R  Berlin → Lakeland Aggregates; 1981-04-01 to 2002-12-31; source msha-controller-operator-history
- **controller_controls_operator:** George R  Berlin → Conneaut Lake Sand & Gravel Inc; 1981-04-01 to 2002-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Big Rock Little Rock LLC  et al → Lakeland Aggregates; 2003-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Big Rock Little Rock LLC  et al → Conneaut Lake Sand & Gravel Inc; 2003-01-01 to 2014-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Dunbar Asphalt Products Inc et al → Conneaut Lake Sand & Gravel Inc; 2003-01-01 to 2014-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Troy  Adzima → Lakeland Aggregates; 2006-06-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lakeland Aggregates, Inc. → Lakeland Aggregates; 2014-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy  Adzima → Lakeland Aggregates, Inc.; 2014-05-13 to current/open; source msha-controller-operator-history