# Relationship history for MSHA mine 2700462

Current hierarchy: **Chris J  Bishop → Cold River Granite → Gowen Quarry**

- 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:** Thomas A  Blais → Gowen Quarry; 2005-04-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Mountain Masons → Gowen Quarry; 2012-10-23 to 2014-07-28; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A  Blais → Rocky Mountain Masons; 2012-10-23 to 2014-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Cold River Granite → Gowen Quarry; 2014-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chris J  Bishop → Gowen Quarry; 2014-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris J  Bishop → Cold River Granite; 2014-07-29 to current/open; source msha-controller-operator-history