# Relationship history for MSHA mine 1202070

Current hierarchy: **Bradley S Poorman; Shelly M Poorman → Old Prairie Products, Inc. → Angola**

- 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

- **controller_controls_mine:** Steuben County-In → Angola; 1988-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Steuben County Highway Department → Angola; 1990-04-01 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Steuben County-In → Steuben County Highway Department; 1990-04-01 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Allen L Poorman → Angola; 1991-02-01 to 2020-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Old Prairie Products, Inc. → Angola; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shelly M Poorman et al → Angola; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shelly M Poorman et al → Old Prairie Products, Inc.; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bradley S Poorman et al → Old Prairie Products, Inc.; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allen L Poorman → Old Prairie Products, Inc.; 2021-01-01 to 2020-12-31; source msha-controller-operator-history