# Relationship history for MSHA mine 2103705

Current hierarchy: **Janet  Hammerlund → TNT Construction Group, LLC → K400**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Thomas E  Hammerlund → K400; 2005-04-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hammerlund Construction → K400; 2010-07-13 to 2023-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Hammerlund → Hammerlund Construction; 2010-07-13 to 2023-03-31; source msha-controller-operator-history
- **operator_operates_mine:** TNT Construction Group, LLC → K400; 2023-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Janet  Hammerlund → K400; 2023-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Janet  Hammerlund → TNT Construction Group, LLC; 2023-04-01 to current/open; source msha-controller-operator-history