# Relationship history for MSHA mine 4103736

Current hierarchy: **Todd  Ramsey; M A  Green → Gulf Coast Sand Products → Gulf Coast Sand Pit**

- 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:** H R Wesson Sand Company → Gulf Coast Sand Pit; 1992-07-01 to 1998-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Herbert R  Wasson → Gulf Coast Sand Pit; 1992-07-01 to 1998-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Herbert R  Wasson → H R Wesson Sand Company; 1992-07-01 to 1998-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Gulf Coast Sand Products → Gulf Coast Sand Pit; 1998-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Todd  Ramsey  et al → Gulf Coast Sand Pit; 1998-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Ramsey  et al → Gulf Coast Sand Products; 1998-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** M A  Green → Gulf Coast Sand Products; 1998-09-22 to current/open; source msha-controller-operator-history