# Relationship history for MSHA mine 1800574

Current hierarchy: **Chaney Enterprises LP → Sustainable Land Use, LLC → Mechanicsville-MD Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Chaney Enterprises LP → Mechanicsville-MD Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B F Asher → Mechanicsville-MD Sand & Gravel; 1950-01-01 to 1984-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin F  Asher Sr  et al → Mechanicsville-MD Sand & Gravel; 1950-01-01 to 1984-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin F  Asher Sr  et al → B F Asher; 1950-01-01 to 1984-12-06; source msha-controller-operator-history
- **operator_operates_mine:** A & B Company Ltd → Mechanicsville-MD Sand & Gravel; 1984-12-07 to 1987-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Martha Ann  Asher → Mechanicsville-MD Sand & Gravel; 1984-12-07 to 1987-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Martha Ann  Asher → A & B Company Ltd; 1984-12-07 to 1987-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Howlin Concrete Inc → Mechanicsville-MD Sand & Gravel; 1987-04-01 to 2022-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Howlin Edward B Jr → Mechanicsville-MD Sand & Gravel; 1987-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howlin Edward B Jr → Howlin Concrete Inc; 1987-04-01 to 2022-02-01; source msha-controller-operator-history
- **operator_operates_mine:** Chaney Enterprises LTD  Partnership → Mechanicsville-MD Sand & Gravel; 2022-02-02 to 2024-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Chaney Enterprises LP → Chaney Enterprises LTD  Partnership; 2022-02-02 to 2024-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Sustainable Land Use, LLC → Mechanicsville-MD Sand & Gravel; 2024-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chaney Enterprises LP → Mechanicsville-MD Sand & Gravel; 2024-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chaney Enterprises LP → Sustainable Land Use, LLC; 2024-03-25 to current/open; source msha-controller-operator-history