# Relationship history for MSHA mine 0405356

Current hierarchy: **Specialty Granules LLC → ISP Granule Products Inc. → ISP Granule Products Inc.**

- 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:** Reed Minerals → ISP Granule Products Inc.; 1999-01-01 to 2002-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Harsco Corp → ISP Granule Products Inc.; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harsco Corp → Reed Minerals; 1999-01-01 to 2002-04-28; source msha-controller-operator-history
- **operator_operates_mine:** ISP Granule Products Inc. → ISP Granule Products Inc.; 2002-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Specialty Granules LLC → ISP Granule Products Inc.; 2002-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Specialty Granules LLC → ISP Granule Products Inc.; 2002-04-29 to current/open; source msha-controller-operator-history