Fig. 2 shows how the wall board is cut, the four pieces necessary being taken from the, same sheet. Fig. 3 illustrates the method of making the corners of the square horn airtight
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280629.2.6.2
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Radio Record, Volume I, Issue 49, 29 June 1928, Page 2
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33Fig. 2 shows how the wall board is cut, the four pieces necessary being taken from the, same sheet. Fig. 3 illustrates the method of making the corners of the square horn airtight Radio Record, Volume I, Issue 49, 29 June 1928, Page 2
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