Waveguide_collection.jpg
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Summary
| Description |
English:
An assortment of standard
waveguide
components, from an advertisement by De Mornay - Budd Inc., New York, in a 1947 electronics magazine. Waveguide is used to conduct
microwave
radio waves from place to place. Microwaves are used in data networking links, communications satellites, satellite TV, radar, and microwave ovens. A waveguide is a conductive metal "pipe" that confines the microwaves.
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| Date | |
| Source | Retrieved July 31, 2014 from Tele-Tech magazine, Caldwell-Clements Inc., Bristol, Connecticut, Vol. 6, No. 4, April 1947, p. 79 on American Radio History website |
| Author | Unknown author |
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Permission
( Reusing this file ) |
This image is from an advertisement for De Mornay - Budd, Inc. without a copyright notice published in a 1947 magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3 , "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain. |
Licensing
|
This work is in the
public domain
in the United States because it was
published
in the United States between 1929 and 1977, inclusive,
without a
copyright notice
. For further explanation, see
Commons:Hirtle chart
as well as a
detailed definition
of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the
rule of the shorter term
for US works (depending on the date of the author's death), such as Canada (50
p.m.a.
), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
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