# Relationship history for MSHA mine 0203032

Current hierarchy: **Thomas M  Martin; Dennis J  Martin → T D Martin Group Sand LLC → Martin Group Properties Pit #525**

- 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:** T D Martin Group Sand LLC → Martin Group Properties Pit #525; 2004-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennis J  Martin et al → Martin Group Properties Pit #525; 2004-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis J  Martin et al → T D Martin Group Sand LLC; 2004-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas M  Martin et al → T D Martin Group Sand LLC; 2004-02-05 to current/open; source msha-controller-operator-history