# Relationship history for MSHA mine 1800773

Current hierarchy: **Chaney Enterprises LP → Chaney Enterprises LTD Partnership → Vienna 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 → Vienna Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Barnett Sand and Gravel LLC → Vienna Sand & Gravel; 2006-09-06 to 2012-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Thomas L.  Barnett → Vienna Sand & Gravel; 2006-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas L.  Barnett → Barnett Sand and Gravel LLC; 2006-09-06 to 2012-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Chaney Enterprises LTD Partnership → Vienna Sand & Gravel; 2012-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chaney Enterprises LP → Chaney Enterprises LTD Partnership; 2012-05-29 to current/open; source msha-controller-operator-history