# Relationship history for MSHA mine 2102850

Current hierarchy: **M G  Hawkinson → Hawkinson Construction Co Inc → Hawkinson (Metso) Crusher #2**

- 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:** W T  Thorson → Hawkinson (Metso) Crusher #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** M G  Hawkinson → Hawkinson (Metso) Crusher #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gene  Brink → Hawkinson (Metso) Crusher #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thorson Inc → Hawkinson (Metso) Crusher #2; 1981-06-01 to 1989-08-15; source msha-controller-operator-history
- **controller_controls_operator:** W T  Thorson → Thorson Inc; 1981-06-01 to 1989-08-15; source msha-controller-operator-history
- **operator_operates_mine:** Brink Sand & Gravel Inc → Hawkinson (Metso) Crusher #2; 1989-08-16 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Gene  Brink → Brink Sand & Gravel Inc; 1989-08-16 to 2003-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Brink Sand & Garvel → Hawkinson (Metso) Crusher #2; 2004-01-01 to 2007-10-07; source msha-controller-operator-history
- **controller_controls_mine:** M G  Hawkinson → Hawkinson (Metso) Crusher #2; 2004-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** M G  Hawkinson → Brink Sand & Garvel; 2004-01-01 to 2007-10-07; source msha-controller-operator-history
- **operator_operates_mine:** Hawkinson Construction Co Inc → Hawkinson (Metso) Crusher #2; 2007-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** M G  Hawkinson → Hawkinson Construction Co Inc; 2007-10-08 to current/open; source msha-controller-operator-history