Zf613. One sound detection device is partially shown on page 124 at this publication with Japanese troops behind it, click here for the source: MB45 Philippine Expeditionary Force by Gasei 1943.pdf. It is available in the Corregidor.org Library. The researcher of the writing team of the new book “ Relentless Hope: A True Story of War and Survival, by David L. Britt”, John Duresky made me aware of it.
My friend John Moffitt who has visited Corregidor 60 times said this: The US Army had sound locators for this purpose on Corregidor. Big elephant eared beasts mounted on a trailer.

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