DEVICE FOR CORRECTING PROPORTIONS OF WATER AND SAND BY SAND MOISTURE CONTENT WHEN PREPARING CONCRETE MIX

摘要

device for the correction of дозированияводы and sand on its humidity during preparation of the concrete, шзид  fj. ",,,,,,,, s (i): course зт::.ц,. 2л1у№г / - l. . the mixture by now. st.775716, от