# Relationship history for MSHA mine 0600255

Current hierarchy: **O & G Industries Inc → O & G Industries Inc → O & G Wash Plant #6**

- 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

- **controller_controls_mine:** O & G Industries Inc → O & G Wash Plant #6; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peckham Industries Inc → O & G Wash Plant #6; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sega Sand & Gravel Inc → O & G Wash Plant #6; 1950-01-01 to 1983-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Meyerhans Stuart → O & G Wash Plant #6; 1950-01-01 to 1983-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Meyerhans Stuart → Sega Sand & Gravel Inc; 1950-01-01 to 1983-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Peckham Materials Corp → O & G Wash Plant #6; 1984-01-01 to 1989-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Peckham Industries Inc → Peckham Materials Corp; 1984-01-01 to 1989-01-31; source msha-controller-operator-history
- **operator_operates_mine:** O & G Industries Inc → O & G Wash Plant #6; 1989-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** O & G Industries Inc → O & G Industries Inc; 1989-02-01 to current/open; source msha-controller-operator-history