# Relationship history for MSHA mine 0901151

Current hierarchy: **Bill  Hammack; Frank  Nichols → 5 R Constructors LLC → 5 R Constructors LLC**

- 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:** 5 R Constructors LLC → 5 R Constructors LLC; 2002-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Hammack  et al → 5 R Constructors LLC; 2002-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Hammack  et al → 5 R Constructors LLC; 2002-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Nichols  et al → 5 R Constructors LLC; 2002-09-23 to current/open; source msha-controller-operator-history