# Relationship history for MSHA mine 0600668

Current hierarchy: **Douglas H  Anderson → WFS Earth Materials LLC → Haddam Gravel 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:** William Flanigan & Son Earth Materials Llc → Haddam Gravel Pit; 1999-01-01 to 2007-05-14; source msha-controller-operator-history
- **controller_controls_mine:** William F  Flanigan Jr  et al → Haddam Gravel Pit; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William F  Flanigan Jr  et al → William Flanigan & Son Earth Materials Llc; 1999-01-01 to 2007-05-14; source msha-controller-operator-history
- **controller_controls_operator:** William F  Flanigan Sr  et al → William Flanigan & Son Earth Materials Llc; 1999-01-01 to 2007-05-14; source msha-controller-operator-history
- **operator_operates_mine:** WFS Earth Materials LLC → Haddam Gravel Pit; 2007-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas H  Anderson → Haddam Gravel Pit; 2007-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas H  Anderson → WFS Earth Materials LLC; 2007-05-15 to current/open; source msha-controller-operator-history