# Relationship history for MSHA mine 0404118

Current hierarchy: **U S Aggregate Inc → Mohave Concrete Incorporated → A-Block Co Inc/Needles Redi-Mix**

- 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:** Brian Lackey Concrete → A-Block Co Inc/Needles Redi-Mix; 1950-01-01 to 1987-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Brian  Lackey → A-Block Co Inc/Needles Redi-Mix; 1950-01-01 to 1987-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Brian  Lackey → Brian Lackey Concrete; 1950-01-01 to 1987-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Needles Redi-Mix Inc → A-Block Co Inc/Needles Redi-Mix; 1987-03-18 to 1997-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Quinto  Polidori → A-Block Co Inc/Needles Redi-Mix; 1987-03-18 to 1997-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Quinto  Polidori → Needles Redi-Mix Inc; 1987-03-18 to 1997-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Mohave Concrete & Materials Inc → A-Block Co Inc/Needles Redi-Mix; 1997-05-01 to 2001-11-25; source msha-controller-operator-history
- **controller_controls_mine:** U S Aggregate Inc → A-Block Co Inc/Needles Redi-Mix; 1997-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Aggregate Inc → Mohave Concrete & Materials Inc; 1997-05-01 to 2001-11-25; source msha-controller-operator-history
- **operator_operates_mine:** Mohave Concrete Incorporated → A-Block Co Inc/Needles Redi-Mix; 2001-11-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** U S Aggregate Inc → A-Block Co Inc/Needles Redi-Mix; 2001-11-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Aggregate Inc → Mohave Concrete Incorporated; 2001-11-26 to current/open; source msha-controller-operator-history