# Relationship history for MSHA mine 0301935

Current hierarchy: **Gary W  Combs → Basic Construction Co → BC 218**

- 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:** Basic Construction Co → BC 218; 2006-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary W  Combs → BC 218; 2006-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary W  Combs → Basic Construction Co; 2006-07-26 to current/open; source msha-controller-operator-history