# Relationship history for MSHA mine 1901094

Current hierarchy: **Steve  Boucher → Central Mass S & G LLC → Central Mass 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Central Mass S & G LLC → Central Mass Sand & Gravel; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Boucher → Central Mass Sand & Gravel; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Boucher → Central Mass S & G LLC; 2000-11-01 to current/open; source msha-controller-operator-history