# Relationship history for MSHA mine 4703355

Current hierarchy: **Travis R Hemker → Brannt-Valley Excavating → Miss Nikki Lee**

- 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:** Robert A  Hemker et al → Miss Nikki Lee; 2001-04-01 to 2016-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Brannt-Valley Excavating → Miss Nikki Lee; 2003-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert A  Hemker et al → Brannt-Valley Excavating; 2003-06-11 to 2016-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Travis R  Hemker et al → Brannt-Valley Excavating; 2003-06-11 to 2016-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Travis R Hemker → Miss Nikki Lee; 2016-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Travis R Hemker → Brannt-Valley Excavating; 2016-06-27 to current/open; source msha-controller-operator-history