# Relationship history for MSHA mine 1401641

Current hierarchy: **Bob S  Swanson; Alice L  Swanson → Native Stone Company Inc → Native Stone Company Inc**

- 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:** Native Stone Company Inc → Native Stone Company Inc; 2005-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alice L  Swanson et al → Native Stone Company Inc; 2005-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alice L  Swanson et al → Native Stone Company Inc; 2005-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bob S  Swanson et al → Native Stone Company Inc; 2005-04-18 to current/open; source msha-controller-operator-history