# Relationship history for MSHA mine 3609340

Current hierarchy: **Tim  Brewer; Adam  Bohn → Tim Brewer & Son Flagstone → Frank's 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:** Vernon Smith → Frank's Quarry; 2005-06-14 to 2006-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Vernon L Smith → Frank's Quarry; 2005-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vernon L Smith → Vernon Smith; 2005-06-14 to 2006-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Tim Brewer & Son Flagstone → Frank's Quarry; 2006-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Brewer  et al → Frank's Quarry; 2006-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Brewer  et al → Tim Brewer & Son Flagstone; 2006-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adam  Bohn  et al → Tim Brewer & Son Flagstone; 2006-10-01 to current/open; source msha-controller-operator-history