# Relationship history for MSHA mine 2902153

Current hierarchy: **Dennis  Swapp → S & M Construction Inc → Swapp Custom Crushing**

- 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:** S & M Construction Inc → Swapp Custom Crushing; 1995-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennis  Swapp et al → Swapp Custom Crushing; 1995-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Swapp et al → S & M Construction Inc; 1995-11-01 to current/open; source msha-controller-operator-history