# Relationship history for MSHA mine 2800949

Current hierarchy: **Frank J  Hunkele → Diamond Sand and Gravel Inc → Diamond Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Baldwin Enterprises Inc → Diamond Sand & Gravel; 1979-01-01 to 2007-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Baldwin → Diamond Sand & Gravel; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Baldwin → Baldwin Enterprises Inc; 1979-01-01 to 2007-01-29; source msha-controller-operator-history
- **operator_operates_mine:** Diamond Sand & Gravel → Diamond Sand & Gravel; 2007-01-30 to 2017-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Frank J  Hunkele  et al → Diamond Sand & Gravel; 2007-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank J  Hunkele  et al → Diamond Sand & Gravel; 2007-01-30 to 2017-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Jane M.  Day → Diamond Sand & Gravel; 2007-05-30 to 2007-10-18; source msha-controller-operator-history
- **controller_controls_mine:** Anthony J  Dellechiaie → Diamond Sand & Gravel; 2007-10-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North Church Gravel, Inc. → Diamond Sand & Gravel; 2017-01-12 to 2019-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Jane M.  Day → North Church Gravel, Inc.; 2017-01-12 to 2007-10-18; source msha-controller-operator-history
- **controller_controls_operator:** Anthony J  Dellechiaie → North Church Gravel, Inc.; 2017-01-12 to 2019-03-20; source msha-controller-operator-history
- **operator_operates_mine:** Diamond Sand and Gravel Inc → Diamond Sand & Gravel; 2019-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank J  Hunkele  et al → Diamond Sand and Gravel Inc; 2019-03-21 to current/open; source msha-controller-operator-history