# Relationship history for MSHA mine 4608409

Current hierarchy: **Arthur (David)  Montgomery → Sandridge Coal LLC → Sandridge Coal 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

- **controller_controls_mine:** Lanny M  Rauer → Sandridge Coal LLC; 1991-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rauer Coal Corp → Sandridge Coal LLC; 1994-05-01 to 1996-04-24; source msha-controller-operator-history
- **controller_controls_operator:** Lanny M  Rauer → Rauer Coal Corp; 1994-05-01 to 1996-04-24; source msha-controller-operator-history
- **operator_operates_mine:** Global Coal Inc → Sandridge Coal LLC; 1996-04-25 to 2001-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Floyd  Goins → Sandridge Coal LLC; 1996-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Floyd  Goins → Global Coal Inc; 1996-04-25 to 2001-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Steven M  Hite et al → Sandridge Coal LLC; 1998-10-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Signal Resources LLC → Sandridge Coal LLC; 2001-01-10 to 2005-12-29; source msha-controller-operator-history
- **controller_controls_operator:** Steven M  Hite et al → Signal Resources LLC; 2001-01-10 to 2005-12-29; source msha-controller-operator-history
- **controller_controls_operator:** Christopher L  Hite et al → Signal Resources LLC; 2001-01-10 to 2005-12-29; source msha-controller-operator-history
- **operator_operates_mine:** Sandridge Coal LLC → Sandridge Coal LLC; 2005-12-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arthur (David)  Montgomery → Sandridge Coal LLC; 2005-12-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur (David)  Montgomery → Sandridge Coal LLC; 2005-12-30 to current/open; source msha-controller-operator-history