# Relationship history for MSHA mine 4502286

Current hierarchy: **Dietz  Kadoun → Bayshore Sand & Gravel → Bayshore Pit**

- 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:** Bayshore Sand & Gravel → Bayshore Pit; 1950-01-01 to 1986-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Richard M  Field → Bayshore Pit; 1950-01-01 to 1986-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Richard M  Field → Bayshore Sand & Gravel; 1950-01-01 to 1986-05-14; source msha-controller-operator-history
- **operator_operates_mine:** James Rock Products → Bayshore Pit; 1986-05-15 to 1988-03-02; source msha-controller-operator-history
- **controller_controls_mine:** William E  James → Bayshore Pit; 1986-05-15 to 1988-03-02; source msha-controller-operator-history
- **controller_controls_operator:** William E  James → James Rock Products; 1986-05-15 to 1988-03-02; source msha-controller-operator-history
- **operator_operates_mine:** Bayshore Sand & Gravel → Bayshore Pit; 1988-03-03 to 1991-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Stephen R  Berndt → Bayshore Pit; 1988-03-03 to 1991-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Stephen R  Berndt → Bayshore Sand & Gravel; 1988-03-03 to 1991-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Bayshore Sand & Gravel → Bayshore Pit; 1991-03-27 to 2001-08-01; source msha-controller-operator-history
- **controller_controls_mine:** W E (Red)  Lumdsen → Bayshore Pit; 1991-03-27 to 2001-08-01; source msha-controller-operator-history
- **controller_controls_operator:** W E (Red)  Lumdsen → Bayshore Sand & Gravel; 1991-03-27 to 2001-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Bayshore Sand & Gravel → Bayshore Pit; 2001-08-02 to 2010-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Dietz  Kadoun → Bayshore Pit; 2001-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dietz  Kadoun → Bayshore Sand & Gravel; 2001-08-02 to 2010-02-02; source msha-controller-operator-history
- **operator_operates_mine:** Bayshore Sand & Gravel → Bayshore Pit; 2010-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dietz  Kadoun → Bayshore Pit; 2010-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dietz  Kadoun → Bayshore Sand & Gravel; 2010-02-03 to current/open; source msha-controller-operator-history