# Relationship history for MSHA mine 4202520

Current hierarchy: **Richard S  Kreig; Richard V  Hipwell → Glacier Rock Products LLC → Glacier RockProducts 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

- **operator_operates_mine:** Decorative Rock Products LLC → Glacier RockProducts LLC; 2008-11-18 to 2018-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Phil S  Hancock → Glacier RockProducts LLC; 2008-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phil S  Hancock → Decorative Rock Products LLC; 2008-11-18 to 2018-10-09; source msha-controller-operator-history
- **operator_operates_mine:** Glacier Rock Investments LLC → Glacier RockProducts LLC; 2018-10-10 to 2020-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Phil S  Hancock → Glacier RockProducts LLC; 2018-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phil S  Hancock → Glacier Rock Investments LLC; 2018-10-10 to 2020-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Glacier Rock Products → Glacier RockProducts LLC; 2020-10-07 to 2025-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Richard Von  Hipwell → Glacier RockProducts LLC; 2020-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard Von  Hipwell → Glacier Rock Products; 2020-10-07 to 2025-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Glacier Rock Products LLC → Glacier RockProducts LLC; 2025-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard S  Kreig et al → Glacier RockProducts LLC; 2025-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard S  Kreig et al → Glacier Rock Products LLC; 2025-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard V  Hipwell et al → Glacier Rock Products LLC; 2025-05-01 to current/open; source msha-controller-operator-history