# Relationship history for MSHA mine 4604662

Current hierarchy: **James L  Laurita → Concorde Corp → Sugar Grove Strip**

- 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:** James L  Laurita → Sugar Grove Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mon Valley Coal & Lumber Company → Sugar Grove Strip; 1975-06-01 to 1977-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Fred O → Sugar Grove Strip; 1975-06-01 to 1977-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Fred O → Mon Valley Coal & Lumber Company; 1975-06-01 to 1977-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Westbury Coal Inc & Sewickley Coal Management Inc → Sugar Grove Strip; 1977-03-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & J Coal Mining Partnership → Sugar Grove Strip; 1977-07-11 to 1977-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Westbury Coal Inc & Sewickley Coal Management Inc → J & J Coal Mining Partnership; 1977-07-11 to 1977-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Laurita Trucking Company Inc → Sugar Grove Strip; 1977-09-01 to 1978-05-23; source msha-controller-operator-history
- **controller_controls_operator:** James L  Laurita → Laurita Trucking Company Inc; 1977-09-01 to 1978-05-23; source msha-controller-operator-history
- **controller_controls_mine:** Consolidated Energy Systems Of Maryland Inc → Sugar Grove Strip; 1978-03-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Maidsville Coal Mining Partnership → Sugar Grove Strip; 1978-05-24 to 1980-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Consolidated Energy Systems Of Maryland Inc → Maidsville Coal Mining Partnership; 1978-05-24 to 1980-02-21; source msha-controller-operator-history
- **controller_controls_mine:** James L  Laurita → Sugar Grove Strip; 1979-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Concorde Corp → Sugar Grove Strip; 1980-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James L  Laurita → Concorde Corp; 1980-02-22 to current/open; source msha-controller-operator-history