# Relationship history for MSHA mine 1901129

Current hierarchy: **Louise  Landers → P A Landers Inc → Power Screen # PS1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Louise  Landers et al → Power Screen # PS1; 1988-07-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P A Landers Inc → Power Screen # PS1; 2003-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Louise  Landers et al → P A Landers Inc; 2003-11-25 to current/open; source msha-controller-operator-history