# Relationship history for MSHA mine 1103170

Current hierarchy: **Randy Lynn  Chamberlain; Barbara Jean  Chamberlain → County Line Sand & Gravel LLC → County Line Sand & Gravel LLC**

- 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

- **operator_operates_mine:** County Line Sand & Gravel LLC → County Line Sand & Gravel LLC; 2007-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barbara Jean  Chamberlain  et al → County Line Sand & Gravel LLC; 2007-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barbara Jean  Chamberlain  et al → County Line Sand & Gravel LLC; 2007-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy Lynn  Chamberlain  et al → County Line Sand & Gravel LLC; 2007-01-27 to current/open; source msha-controller-operator-history