# Relationship history for MSHA mine 4102428

Current hierarchy: **Manshack Mike (I C) & Verlon → Manshack Dragline & Truck Services → Teal 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:** Golden Triangle Materials Inc → Teal Sand Pit; 1950-01-01 to 1979-12-12; source msha-controller-operator-history
- **controller_controls_mine:** Dal Sasso Construction Company → Teal Sand Pit; 1950-01-01 to 1979-12-12; source msha-controller-operator-history
- **controller_controls_operator:** Dal Sasso Construction Company → Golden Triangle Materials Inc; 1950-01-01 to 1979-12-12; source msha-controller-operator-history
- **operator_operates_mine:** Manshack Dragline & Truck Services → Teal Sand Pit; 1979-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Manshack Mike (I C) & Verlon Et Al → Teal Sand Pit; 1979-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Manshack Mike (I C) & Verlon Et Al → Manshack Dragline & Truck Services; 1979-12-13 to current/open; source msha-controller-operator-history