# Relationship history for MSHA mine 4608001

Current hierarchy: **Robert  Helton → KWV Operations LLC → Alma Mine No 2**

- 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:** Brown Eugene → Alma Mine No 2; 1990-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cow Creek Coal Company → Alma Mine No 2; 1991-02-01 to 1994-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Brown Eugene → Cow Creek Coal Company; 1991-02-01 to 1994-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Harry M  Hylton → Alma Mine No 2; 1994-03-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Patton Inc → Alma Mine No 2; 1994-04-04 to 2007-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Harry M  Hylton → Patton Inc; 1994-04-04 to 2007-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Helton → Alma Mine No 2; 2007-03-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** KWV Operations LLC → Alma Mine No 2; 2007-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Helton → KWV Operations LLC; 2007-04-12 to current/open; source msha-controller-operator-history