Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Sei Kazuyosi,"1035) On the Non-destructive Testing Apparatus in the Field of the Structural Concrete Strength : Study of Non-destructive Concrete Testing. Part 1(Materials, Execution)",Transactions of the Architectural Institute of Japan,03871185,Architectural Institute of Japan,1961,69.1,0,137-140,https://cir.nii.ac.jp/crid/1390282680545969664,https://doi.org/10.3130/aijsaxx.69.1.0_137