# Relationship history for MSHA mine 2402135

Current hierarchy: **Knife River Corporation → JTL Group Incorporated → MRM MOBILE CRUSHER #176**

- 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:** Frank A  Thomas  et al → MRM MOBILE CRUSHER #176; 1984-05-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Polson Ready Mix Concrete Inc → MRM MOBILE CRUSHER #176; 1998-02-01 to 2000-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Frank A  Thomas  et al → Polson Ready Mix Concrete Inc; 1998-02-01 to 2000-09-30; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → MRM MOBILE CRUSHER #176; 1999-09-01 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Polson Ready Mix Concrete Inc → MRM MOBILE CRUSHER #176; 2000-10-01 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → MRM MOBILE CRUSHER #176; 2000-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Polson Ready Mix Concrete Inc; 2000-10-01 to 2001-12-31; source msha-controller-operator-history
- **operator_operates_mine:** JTL Group Incorporated → MRM MOBILE CRUSHER #176; 2002-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → JTL Group Incorporated; 2002-01-01 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → MRM MOBILE CRUSHER #176; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → JTL Group Incorporated; 2023-06-01 to current/open; source msha-controller-operator-history