# Relationship history for MSHA mine 3603295

Current hierarchy: **New Enterprise Stone & Lime Company Inc; New Enterprise Stone & Lime Com → Eastern Industries Inc → Mt Bethel Sand & Gravel Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Alpha Portland Industries Inc → Mt Bethel Sand & Gravel Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stabler Companies Inc → Mt Bethel Sand & Gravel Plant; 1950-01-01 to 2008-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Houdaille Construction Materials Inc → Mt Bethel Sand & Gravel Plant; 1950-01-01 to 1978-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Houdaille Industries Inc → Mt Bethel Sand & Gravel Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Houdaille Industries Inc → Houdaille Construction Materials Inc; 1950-01-01 to 1978-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Alpha Portland Cement Company → Mt Bethel Sand & Gravel Plant; 1978-06-01 to 1983-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Portland Industries Inc → Alpha Portland Cement Company; 1978-06-01 to 1983-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Industries Inc → Mt Bethel Sand & Gravel Plant; 1983-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stabler Companies Inc → Eastern Industries Inc; 1983-10-25 to 2008-01-31; source msha-controller-operator-history
- **controller_controls_mine:** New Enterprise Stone & Lime Company Inc → Mt Bethel Sand & Gravel Plant; 2008-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → Eastern Industries Inc; 2008-02-01 to current/open; source msha-controller-operator-history