# Relationship history for MSHA mine 3900666

Current hierarchy: **Michael J.  Redd → Grosz Sand & Gravel → Goetz Pit #2**

- 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:** Grosz Construction Company → Goetz Pit #2; 1950-01-01 to 2001-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Jan  Grosz → Goetz Pit #2; 1950-01-01 to 2001-03-09; source msha-controller-operator-history
- **controller_controls_operator:** Jan  Grosz → Grosz Construction Company; 1950-01-01 to 2001-03-09; source msha-controller-operator-history
- **operator_operates_mine:** Grosz Sand & Gravel → Goetz Pit #2; 2001-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael J.  Redd → Goetz Pit #2; 2001-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael J.  Redd → Grosz Sand & Gravel; 2001-03-10 to current/open; source msha-controller-operator-history