News for: chalkboard

Student invents chalkboard cleaning machine

09/21/2016 10:31

VTV.vn - For many teachers, chalk dust is an inevitable part of their daily work, which is quite uncomfortable and can cause health problems.

Tags: chalkboard, machine, invention

Top VND Exchange Rates

Auto-refesh 15m	USD	EUR	AUD
1 VND Inverse:	0.00004 22,510.0	0.00004 25,226.0	0.00006 15,674.0

Mid-market rates: 2025-12-21 11:16 UTC

43 NGUYEN CHI THANH STREET - BA DINH DISTRICT - HA NOI - VIET NAM

Editor-in-chief: VU THANH THUY

Deputy Editor-in-chief: NGUYEN THI MY HANH, PHAM QUOC THANG, NGUYEN TRONG NINH

Tel: +84 66 897 897

Licence No. 483/GP-BTTTT dated December 29, 2023 by the Ministry of Information and Communications.