# Relationship history for MSHA mine 0900720

Current hierarchy: **Joseph L Scherer → CBS Quarries LLC → North Georgia Stone**

- 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

- **operator_operates_mine:** North Georgia Stone Company → North Georgia Stone; 1950-01-01 to 1987-04-30; source msha-controller-operator-history
- **controller_controls_mine:** North Georgia Stone Company → North Georgia Stone; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** North Georgia Stone Company → North Georgia Stone Company; 1950-01-01 to 1987-04-30; source msha-controller-operator-history
- **operator_operates_mine:** North Georgia Stone → North Georgia Stone; 1987-05-01 to 2022-07-02; source msha-controller-operator-history
- **controller_controls_mine:** Bobby  Long → North Georgia Stone; 1987-05-01 to 2014-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Long → North Georgia Stone; 1987-05-01 to 2014-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Terrie L  Long → North Georgia Stone; 2014-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terrie L  Long → North Georgia Stone; 2014-04-09 to 2022-07-02; source msha-controller-operator-history
- **operator_operates_mine:** CBS Quarries LLC → North Georgia Stone; 2022-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph L Scherer → North Georgia Stone; 2022-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph L Scherer → CBS Quarries LLC; 2022-07-03 to current/open; source msha-controller-operator-history