Glass plate positives

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<blockquote class="wp-embedded-content" data-secret="SsLrzZY8Ob"><a href="https://mmkphoto.de/2026/06/04/glass-plate-positives/">Glass plate positives</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://mmkphoto.de/2026/06/04/glass-plate-positives/embed/#?secret=SsLrzZY8Ob" width="600" height="400" title="&#8222;Glass plate positives&#8220; &#8212; mmkphoto.de" data-secret="SsLrzZY8Ob" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script>
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