# Relationship history for MSHA mine 4300199

Current hierarchy: **Jerry C  Tabor → Tabor Earth Extractors → Tabor Earth Extractors**

- 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:** John H Gross → Tabor Earth Extractors; 1950-01-01 to 1996-03-31; source msha-controller-operator-history
- **controller_controls_mine:** John H  Gross → Tabor Earth Extractors; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John H  Gross → John H Gross; 1950-01-01 to 1996-03-31; source msha-controller-operator-history
- **operator_operates_mine:** John  Gross Trucking & Excavating → Tabor Earth Extractors; 1996-04-01 to 2014-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Gross → Tabor Earth Extractors; 1996-04-01 to 2012-10-10; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Gross → John  Gross Trucking & Excavating; 1996-04-01 to 2012-10-10; source msha-controller-operator-history
- **controller_controls_mine:** Nancy M  Gross → Tabor Earth Extractors; 2012-10-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nancy M  Gross → John  Gross Trucking & Excavating; 2012-10-11 to 2014-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Tabor Earth Extractors → Tabor Earth Extractors; 2014-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerry C  Tabor → Tabor Earth Extractors; 2014-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry C  Tabor → Tabor Earth Extractors; 2014-05-05 to current/open; source msha-controller-operator-history