# Relationship history for MSHA mine 0400038

Current hierarchy: **Holly Sugar Corp → Limestone Products Company Inc → SPRECKELS LIMESTONE&AGGREGATE PR**

- 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:** California Rock & Gravel Company → SPRECKELS LIMESTONE&AGGREGATE PR; 1950-01-01 to 1978-07-19; source msha-controller-operator-history
- **controller_controls_mine:** G W  Jamieson → SPRECKELS LIMESTONE&AGGREGATE PR; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** G W  Jamieson → California Rock & Gravel Company; 1950-01-01 to 1978-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Amstar Corp → SPRECKELS LIMESTONE&AGGREGATE PR; 1978-07-20 to 1988-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Amstar Corp → SPRECKELS LIMESTONE&AGGREGATE PR; 1978-07-20 to 1988-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Amstar Corp → Amstar Corp; 1978-07-20 to 1988-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Limestone Products Company Inc → SPRECKELS LIMESTONE&AGGREGATE PR; 1988-07-12 to 1997-11-02; source msha-controller-operator-history
- **controller_controls_mine:** Spreckels Industries Inc → SPRECKELS LIMESTONE&AGGREGATE PR; 1988-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spreckels Industries Inc → Limestone Products Company Inc; 1988-07-12 to 1997-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Limestone Products Company Inc → SPRECKELS LIMESTONE&AGGREGATE PR; 1997-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holly Sugar Corp → SPRECKELS LIMESTONE&AGGREGATE PR; 1997-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holly Sugar Corp → Limestone Products Company Inc; 1997-11-03 to current/open; source msha-controller-operator-history