# Relationship history for MSHA mine 3503702

Current hierarchy: **Phil  Kaufmann; Dustin  Kaufmann → Rock N Road Quarry LLC → Rock N Road Quarry 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Rock N Road Quarry → Rock N Road Quarry LLC; 2008-08-06 to 2021-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Lee G  Bissell → Rock N Road Quarry LLC; 2008-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lee G  Bissell → Rock N Road Quarry; 2008-08-06 to 2021-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Rock N Road Quarry LLC → Rock N Road Quarry LLC; 2021-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dustin  Kaufmann et al → Rock N Road Quarry LLC; 2021-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dustin  Kaufmann et al → Rock N Road Quarry LLC; 2021-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phil  Kaufmann et al → Rock N Road Quarry LLC; 2021-06-15 to current/open; source msha-controller-operator-history