# Relationship history for MSHA mine 3000041

Current hierarchy: **New Enterprise Stone & Lime Company Inc → New Enterprise Stone and Lime Co., Inc. → Como 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

- **operator_operates_mine:** Buffalo Slag Company Inc → Como Quarry; 1950-01-01 to 1983-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → Como Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Buffalo Slag Company Inc; 1950-01-01 to 1983-05-15; source msha-controller-operator-history
- **controller_controls_mine:** New Enterprise Stone & Lime Company Inc → Como Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** R E  Garman  et al → Como Quarry; 1978-10-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Buffalo Crushed Stone Company Inc → Como Quarry; 1983-05-16 to 2000-07-31; source msha-controller-operator-history
- **controller_controls_operator:** R E  Garman  et al → Buffalo Crushed Stone Company Inc; 1983-05-16 to 2000-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Buffalo Crushed Stone Company Inc → Como Quarry; 2000-08-01 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_mine:** New Enterprise Stone & Lime Company Inc → Como Quarry; 2000-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → Buffalo Crushed Stone Company Inc; 2000-08-01 to 2010-12-31; source msha-controller-operator-history
- **operator_operates_mine:** New Enterprise Stone and Lime Co., Inc. → Como Quarry; 2011-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → New Enterprise Stone and Lime Co., Inc.; 2011-01-01 to current/open; source msha-controller-operator-history