# Relationship history for MSHA mine 2103600

Current hierarchy: **Chad M  Serbus; Craig G  Serbus → Gordy Serbus & Sons Gravel LLC → Granite Valley 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:** Gordy Serbus & Sons Gravel LLC → Granite Valley Quarry; 2007-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gordy  Serbus  et al → Granite Valley Quarry; 2007-07-24 to 2022-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Gordy  Serbus  et al → Gordy Serbus & Sons Gravel LLC; 2007-07-24 to 2022-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Craig G  Serbus et al → Granite Valley Quarry; 2022-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig G  Serbus et al → Gordy Serbus & Sons Gravel LLC; 2022-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad M  Serbus et al → Gordy Serbus & Sons Gravel LLC; 2022-10-26 to current/open; source msha-controller-operator-history