# Relationship history for MSHA mine 3606684

Current hierarchy: **New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Company → Boswell Quarry**

- 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

- **controller_controls_mine:** New Enterprise Stone & Lime Company Inc → Boswell Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Commonwealth Stone Inc → Boswell Quarry; 1978-03-09 to 1999-07-05; source msha-controller-operator-history
- **controller_controls_mine:** Donald L  Fetterolf → Boswell Quarry; 1978-03-09 to 1999-07-05; source msha-controller-operator-history
- **controller_controls_operator:** Donald L  Fetterolf → Commonwealth Stone Inc; 1978-03-09 to 1999-07-05; source msha-controller-operator-history
- **operator_operates_mine:** New Enterprise Stone & Lime Company → Boswell Quarry; 1999-07-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Company; 1999-07-06 to current/open; source msha-controller-operator-history