# Relationship history for MSHA mine 3000292

Current hierarchy: **Tradebe Northeast LLC → NORLITE → COHOES MINE AND MILL**

- 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:** Norlite Corp → COHOES MINE AND MILL; 1950-01-01 to 1991-12-22; source msha-controller-operator-history
- **controller_controls_mine:** P J Keating Company → COHOES MINE AND MILL; 1950-01-01 to 1991-12-22; source msha-controller-operator-history
- **controller_controls_operator:** P J Keating Company → Norlite Corp; 1950-01-01 to 1991-12-22; source msha-controller-operator-history
- **operator_operates_mine:** Norlite Corp → COHOES MINE AND MILL; 1991-12-23 to 1995-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Rheinisch-Westfaelische Elektrizitaetswerk Ag → COHOES MINE AND MILL; 1991-12-23 to 1995-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Rheinisch-Westfaelische Elektrizitaetswerk Ag → Norlite Corp; 1991-12-23 to 1995-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Norlite → COHOES MINE AND MILL; 1995-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tradebe Northeast LLC → COHOES MINE AND MILL; 1995-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tradebe Northeast LLC → Norlite; 1995-12-01 to current/open; source msha-controller-operator-history