# Relationship history for MSHA mine 3003818

Current hierarchy: **Paul J Hognestad → TROY TOPSOIL AND AGGREGATES INC. → POWERSCREEN CHIEFTAN 1700**

- 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:** Anthony L  Grande II → POWERSCREEN CHIEFTAN 1700; 1990-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Troy Topsoil Co. Inc. → POWERSCREEN CHIEFTAN 1700; 2011-07-12 to 2022-01-11; source msha-controller-operator-history
- **controller_controls_operator:** Anthony L  Grande II → Troy Topsoil Co. Inc.; 2011-07-12 to 2022-01-11; source msha-controller-operator-history
- **operator_operates_mine:** Troy Topsoil and Aggregates Inc. → POWERSCREEN CHIEFTAN 1700; 2022-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul J Hognestad → POWERSCREEN CHIEFTAN 1700; 2022-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul J Hognestad → Troy Topsoil and Aggregates Inc.; 2022-01-12 to current/open; source msha-controller-operator-history