# Relationship history for MSHA mine 1300675

Current hierarchy: **Mid America Materials Company → Hallett Materials → Jefferson Pit #55**

- 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:** F & D Construction Inc → Jefferson Pit #55; 1950-01-01 to 1995-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Ogren Beverly J - Steven D Et Al → Jefferson Pit #55; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ogren Beverly J - Steven D Et Al → F & D Construction Inc; 1950-01-01 to 1995-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Mid America Materials Company → Jefferson Pit #55; 1986-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Materials → Jefferson Pit #55; 1995-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mid America Materials Company → Hallett Materials; 1995-11-07 to current/open; source msha-controller-operator-history