# Relationship history for MSHA mine 3002943

Current hierarchy: **Merritt Nina T → Ntm Materials Inc → NTM MATERIALS, 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:** Ntm Materials Inc → NTM MATERIALS, INC.; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Merritt Nina T → NTM MATERIALS, INC.; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Merritt Nina T → Ntm Materials Inc; 1990-03-01 to current/open; source msha-controller-operator-history