# Relationship history for MSHA mine 4801887

Current hierarchy: **Howard Brent Lee → HB Lee Construction → 2016 Trakpactor - Crusher**

- 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

- **controller_controls_mine:** Howard Brent Lee → 2016 Trakpactor - Crusher; 2007-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** HB Lee Construction → 2016 Trakpactor - Crusher; 2024-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard Brent Lee → HB Lee Construction; 2024-09-17 to current/open; source msha-controller-operator-history