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			A modern similar product from the original supplier, Edwards Signalling. https://www.edwards-signals.com/file...talog_Page.pdf It is rated for 6VDC operation as well as AC. (Sorry, no 12 V seen on their website - an argument against converting trucks to 12V?) Model 725 are on ebay as low as $9US. On edit: it looks as if at least two different buzzers were used. Last edited by Grant Bowker; 07-07-17 at 01:38. | 
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