![It seems that the words post office,registered mail,certified mail,priority mail express,and signature confirmation are trade marked. : r/mildlyinteresting It seems that the words post office,registered mail,certified mail,priority mail express,and signature confirmation are trade marked. : r/mildlyinteresting](https://i.redd.it/3976qp9zbda01.jpg)
It seems that the words post office,registered mail,certified mail,priority mail express,and signature confirmation are trade marked. : r/mildlyinteresting
![Briefmarke 1935, Grossbritannien Registered LettER 4.5p, ...Imperial and Foreign..., 1935 - Briefmarken sammeln - PostBeeld.de - Online Briefmarken kaufen - Sammeln Briefmarke 1935, Grossbritannien Registered LettER 4.5p, ...Imperial and Foreign..., 1935 - Briefmarken sammeln - PostBeeld.de - Online Briefmarken kaufen - Sammeln](https://www.postbeeld.de/media/catalog/product/cache/9/small_image/cda336a043e3dd4940536205f9a4466b/e/n/enpeu41.jpg)
Briefmarke 1935, Grossbritannien Registered LettER 4.5p, ...Imperial and Foreign..., 1935 - Briefmarken sammeln - PostBeeld.de - Online Briefmarken kaufen - Sammeln
![Briefmarke 1913, Sri Lanka (Ceylon) Registered envelope 10c, 1913 - Briefmarken sammeln - PostBeeld.de - Online Briefmarken kaufen - Sammeln Briefmarke 1913, Sri Lanka (Ceylon) Registered envelope 10c, 1913 - Briefmarken sammeln - PostBeeld.de - Online Briefmarken kaufen - Sammeln](https://www.postbeeld.de/media/catalog/product/cache/9/small_image/cda336a043e3dd4940536205f9a4466b/s/c/sceeu15b.jpg)
Briefmarke 1913, Sri Lanka (Ceylon) Registered envelope 10c, 1913 - Briefmarken sammeln - PostBeeld.de - Online Briefmarken kaufen - Sammeln
![Briefmarke 1908, Trinidad und Tobago Registered letter postal stationary uprated to Germany, 1908 - Briefmarken sammeln - PostBeeld.de - Online Briefmarken kaufen - Sammeln Briefmarke 1908, Trinidad und Tobago Registered letter postal stationary uprated to Germany, 1908 - Briefmarken sammeln - PostBeeld.de - Online Briefmarken kaufen - Sammeln](https://www.postbeeld.de/media/catalog/product/cache/9/small_image/cda336a043e3dd4940536205f9a4466b/t/n/tnp_908a.jpg)