Portal Gun Service and Repair Manual by Adho1982
You are now in possession of the Aperture Science handheld portal device. With it, you can create your own portals. These intra-dimensional gates have proven to be completely safe. The device, however, has not. Do not touch the operational end of the device. Do not look directly at the operational end of the device. Do not submerge the device in liquid, even partially. Most importantly, under no circumstances should you— static
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Very nice!