# Relationship history for MSHA mine 1002159

Current hierarchy: **Greg  Frohn; Dale  Friddle → FLI Forest and Construction → Chilco Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** FLI Forest and Construction → Chilco Quarry; 2008-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Greg  Frohn et al → Chilco Quarry; 2008-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Frohn et al → FLI Forest and Construction; 2008-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dale  Friddle et al → FLI Forest and Construction; 2008-06-07 to current/open; source msha-controller-operator-history