# Relationship history for MSHA mine 3500555

Current hierarchy: **Knife River Corporation → LTM Incorporated dba Knife River Materials → Mobile Crusher # 3**

- 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:** Bohemia Inc → Mobile Crusher # 3; 1950-01-01 to 1991-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Dick  Tinney → Mobile Crusher # 3; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dick  Tinney → Bohemia Inc; 1950-01-01 to 1991-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Umpqua River Navigation Co → Mobile Crusher # 3; 1991-05-01 to 2007-07-02; source msha-controller-operator-history
- **controller_controls_mine:** Schaefer John & Albert E Lewis → Mobile Crusher # 3; 1991-05-01 to 2000-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Schaefer John & Albert E Lewis → Umpqua River Navigation Co; 1991-05-01 to 2000-05-14; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Mobile Crusher # 3; 2000-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Umpqua River Navigation Co; 2000-05-15 to 2007-07-02; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Mobile Crusher # 3; 2004-05-28 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** LTM Incorporated dba Knife River Materials → Mobile Crusher # 3; 2007-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → LTM Incorporated dba Knife River Materials; 2007-07-03 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → Mobile Crusher # 3; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → LTM Incorporated dba Knife River Materials; 2023-06-01 to current/open; source msha-controller-operator-history