# Relationship history for MSHA mine 4502946

Current hierarchy: **John  Brumfield → Brumfield Construction, Inc. → Delphi Quarry**

- 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:** Doris  Martin → Delphi Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tom Martin Construction Inc → Delphi Quarry; 1981-11-01 to 1985-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Doris  Martin → Tom Martin Construction Inc; 1981-11-01 to 1985-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Jkh Investments Inc → Delphi Quarry; 1985-06-26 to 1988-11-01; source msha-controller-operator-history
- **controller_controls_mine:** Harry L  Sumrok et al → Delphi Quarry; 1985-06-26 to 1988-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Harry L  Sumrok et al → Jkh Investments Inc; 1985-06-26 to 1988-11-01; source msha-controller-operator-history
- **operator_operates_mine:** Tom Martin Construction Inc → Delphi Quarry; 1988-11-02 to 1998-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Doris  Martin → Tom Martin Construction Inc; 1988-11-02 to 1998-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Joe B  Clerget  et al → Delphi Quarry; 1995-03-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cascade Sand & Gravel Inc → Delphi Quarry; 1998-03-02 to 2003-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Joe B  Clerget  et al → Cascade Sand & Gravel Inc; 1998-03-02 to 2003-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Larry A  Clerget  et al → Cascade Sand & Gravel Inc; 1998-03-02 to 2003-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Albert N  DeAtley et al → Delphi Quarry; 1999-06-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quality Rock Products Inc → Delphi Quarry; 2003-05-20 to 2021-05-25; source msha-controller-operator-history
- **controller_controls_operator:** Albert N  DeAtley et al → Quality Rock Products Inc; 2003-05-20 to 2021-05-25; source msha-controller-operator-history
- **controller_controls_operator:** Brien N  DeAtley et al → Quality Rock Products Inc; 2003-05-20 to 2021-05-25; source msha-controller-operator-history
- **controller_controls_mine:** John  Brumfield → Delphi Quarry; 2017-03-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brumfield Construction, Inc. → Delphi Quarry; 2021-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Brumfield → Brumfield Construction, Inc.; 2021-05-26 to current/open; source msha-controller-operator-history