These are the diagrams for Israel Pilot's 1941 US Patent #2245413 and are public domain. The now expired patent covers a design for improving the comfort and wear-ability for brassieres using a "diagonal slash" where the shoulder straps meet the brassiere cup. This is public domain and was sources from the US patent office. This diagram is part of the Wonder-Bra history. Israel Pilot trademarked the Wonder-Bra in 1935. His company, D'Amour, manufactured this design under that trade-mark in the US from 1940 through 1955.
United States Patent and Trademark Office
1941-06-10
Transferred from <span class="plainlinks"><a class="external text" href="https://en.wikipedia.org">en.wikipedia</a></span> to Commons.; original source was <a rel="nofollow" class="external text" href="http://pdfpiw.uspto.gov/.piw?Docid=02245413&amp;homeurl=http%3A%2F%2Fpatft.uspto.gov%2Fnetacgi%2Fnph-Parser%3FSect1%3DPTO1%2526Sect2%3DHITOFF%2526d%3DPALL%2526p%3D1%2526u%3D%25252Fnetahtml%25252FPTO%25252Fsrchnum.htm%2526r%3D1%2526f%3DG%2526l%3D50%2526s1%3D2245413.PN.%2526OS%3DPN%2F2245413%2526RS%3DPN%2F2245413&amp;PageNum=&amp;Rtype=&amp;SectionNum=&amp;idkey=NONE&amp;Input=View+first+page">here</a>