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| All Patents in class 406/18 | |||||
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| Number | Date | Patentee | Title | Type | |
| 975,501 | Nov. 15, 1910 | T. Bemis | Pneumatic-despatch apparatus | ||
| 1,048,931 | Dec. 31, 1912 | T. Bemis | Pneumatic-despatch apparatus | ||
| 1,079,311 | Nov. 18, 1913 | T. Bemis | Pneumatic-despatch apparatus | ||
| 1,090,375 | Mar. 17, 1914 | T. Bemis | Pneumatic-despatch apparatus | ||