# Relationship history for MSHA mine 3603157

Current hierarchy: **New Enterprise Stone & Lime Company Inc → New Enterprise Stone and Lime Co, Inc → MT CYDONIA SAND PLANT III**

- 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

- **controller_controls_mine:** New Enterprise Stone & Lime Company Inc → MT CYDONIA SAND PLANT III; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & L Goodhart Sand & Gravel → MT CYDONIA SAND PLANT III; 1950-01-01 to 1987-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Maurice H  Ramond → MT CYDONIA SAND PLANT III; 1950-01-01 to 1987-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Maurice H  Ramond → C & L Goodhart Sand & Gravel; 1950-01-01 to 1987-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Rimac Inc → MT CYDONIA SAND PLANT III; 1987-08-25 to 1994-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Furnley H  Frisch → MT CYDONIA SAND PLANT III; 1987-08-25 to 1994-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Furnley H  Frisch → Rimac Inc; 1987-08-25 to 1994-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Nep Sand & Gravel Inc → MT CYDONIA SAND PLANT III; 1994-12-01 to 1997-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Dennis M Grimm → MT CYDONIA SAND PLANT III; 1994-12-01 to 1997-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Dennis M Grimm → Nep Sand & Gravel Inc; 1994-12-01 to 1997-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Valley Quarries Inc → MT CYDONIA SAND PLANT III; 1997-06-01 to 2010-08-04; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → Valley Quarries Inc; 1997-06-01 to 2010-08-04; source msha-controller-operator-history
- **operator_operates_mine:** New Enterprise Stone and Lime Co, Inc → MT CYDONIA SAND PLANT III; 2010-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** New Enterprise Stone & Lime Company Inc → New Enterprise Stone and Lime Co, Inc; 2010-08-05 to current/open; source msha-controller-operator-history