# Relationship history for MSHA mine 2200611

Current hierarchy: **Pryor J J → Hattiesburg Materials Inc → Plant Ab**

- 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:** Superior Sand & Gravel Company Inc → Plant Ab; 1989-03-01 to 1989-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Lowery Douglas T → Plant Ab; 1989-03-01 to 1989-12-04; source msha-controller-operator-history
- **controller_controls_operator:** Lowery Douglas T → Superior Sand & Gravel Company Inc; 1989-03-01 to 1989-12-04; source msha-controller-operator-history
- **operator_operates_mine:** Superior Sand & Gravel Company Inc → Plant Ab; 1989-12-05 to 1993-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Martin John → Plant Ab; 1989-12-05 to 1993-08-18; source msha-controller-operator-history
- **controller_controls_operator:** Martin John → Superior Sand & Gravel Company Inc; 1989-12-05 to 1993-08-18; source msha-controller-operator-history
- **operator_operates_mine:** Hub City Gravel Inc → Plant Ab; 1993-08-19 to 1995-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Mc Lain Mitchell R → Plant Ab; 1993-08-19 to 1995-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Mc Lain Mitchell R → Hub City Gravel Inc; 1993-08-19 to 1995-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Hattiesburg Materials Inc → Plant Ab; 1995-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pryor J J → Plant Ab; 1995-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pryor J J → Hattiesburg Materials Inc; 1995-03-30 to current/open; source msha-controller-operator-history