# Relationship history for MSHA mine 3607953

Current hierarchy: **Harry J  Silvers → Harry Silvers Quarry → Fields 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

- **operator_operates_mine:** Elwood Mc Laud → Fields Quarry; 1987-11-01 to 1989-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Elwood  McLaud → Fields Quarry; 1987-11-01 to 1989-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Elwood  McLaud → Elwood Mc Laud; 1987-11-01 to 1989-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Robert Fields → Fields Quarry; 1989-03-07 to 2004-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Fields → Fields Quarry; 1989-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Fields → Robert Fields; 1989-03-07 to 2004-09-20; source msha-controller-operator-history
- **controller_controls_mine:** John  Strope → Fields Quarry; 2001-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles E  Johnson → Fields Quarry; 2004-04-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kithcart Stone → Fields Quarry; 2004-09-21 to 2008-05-05; source msha-controller-operator-history
- **controller_controls_mine:** William N  Kithcart → Fields Quarry; 2004-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William N  Kithcart → Kithcart Stone; 2004-09-21 to 2008-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Harry J  Silvers → Fields Quarry; 2008-01-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Strope's Flagstone → Fields Quarry; 2008-05-06 to 2008-07-08; source msha-controller-operator-history
- **controller_controls_operator:** John  Strope → Strope's Flagstone; 2008-05-06 to 2008-07-08; source msha-controller-operator-history
- **operator_operates_mine:** Chuck's Rocks → Fields Quarry; 2008-07-09 to 2009-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Charles E  Johnson → Chuck's Rocks; 2008-07-09 to 2009-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Harry Silvers Quarry → Fields Quarry; 2009-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harry J  Silvers → Harry Silvers Quarry; 2009-06-23 to current/open; source msha-controller-operator-history