# Relationship history for MSHA mine 3600657

Current hierarchy: **New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Co., Inc. → Narvon Minerals**

- 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 → Narvon Minerals; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Narvon Products Corp → Narvon Minerals; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Combustion Engineering Inc → Narvon Minerals; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Combustion Engineering Inc → Narvon Products Corp; 1950-01-01 to 1986-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Narvon Products → Narvon Minerals; 1987-01-01 to 1995-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Envirosource Inc → Narvon Minerals; 1987-01-01 to 1995-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Envirosource Inc → Narvon Products; 1987-01-01 to 1995-04-09; source msha-controller-operator-history
- **operator_operates_mine:** Narvon Processors Inc → Narvon Minerals; 1995-04-10 to 1999-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Reed Jr → Narvon Minerals; 1995-04-10 to 1999-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Reed Jr → Narvon Processors Inc; 1995-04-10 to 1999-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Martin Limestone Inc → Narvon Minerals; 2000-01-01 to 2010-08-04; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → Martin Limestone Inc; 2000-01-01 to 2010-08-04; source msha-controller-operator-history
- **operator_operates_mine:** New Enterprise Stone & Lime Co., Inc. → Narvon Minerals; 2010-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → New Enterprise Stone & Lime Co., Inc.; 2010-08-05 to current/open; source msha-controller-operator-history