# Relationship history for MSHA mine 5001859

Current hierarchy: **Bristol Bay Native Corporation → Bristol Construction Services LLC → Bristol Portable Plant #1**

- 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

- **operator_operates_mine:** L and C Services Inc. → Bristol Portable Plant #1; 2007-10-10 to 2016-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Linda K  Bowers → Bristol Portable Plant #1; 2007-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Linda K  Bowers → L and C Services Inc.; 2007-10-10 to 2016-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Bristol Construction Services LLC → Bristol Portable Plant #1; 2016-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bristol Bay Native Corporation → Bristol Portable Plant #1; 2016-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bristol Bay Native Corporation → Bristol Construction Services LLC; 2016-09-22 to current/open; source msha-controller-operator-history