transponder

2 photos tagged transponder, from 1 member of Flickr Commons.

Where were these photos tagged?

None of these photos are geotagged.

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Photos tagged transponder:

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The last upload was March 2017.

Here’s a selection of the conversations happening on these photos:

precious amount said:
There are no serial numbers on the black boxes so I've tagged these images as prototypes. If this is wrong, please remove the "prototype," "mock up," and "model" tags.