English: Raytheon introduced the CK722 in early 1953 at $7.60 each; the price was reduced to $3.50 in late 1954. The CK722 was actually a selected "fall out" from the firm's premium-priced hearing-aid transistor line. This germanium PNP junction transistor was very popular with hobbyist and was featured in many construction articles in magazines and books. This advertisement appeared on page 8 of the April 1955 issue of the Popular Electronics.
Date
Source
Scanned and cropped from page 8 of the April 1954 Popular Electronics magazine by Michael Holley Swtpc6800
This advertisement did not have a copyright notice and is in the public domain.
From the US Copyright Office Circular 3. Page 3, Contributions to Collective Works. (A magazine is a "collective work.")
A notice for the collective work will not serve as the notice for advertisements inserted on behalf of persons other than the copyright owner of the collective work. These advertisements should each bear a separate notice in the name of the copyright owner of the advertisement.
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== {{int:filedesc}} == {{Information |Description={{en|1= Raytheon introduced the CK722 in early 1953 at $7.60 each; the price was reduced to $3.50 in late 1954. The CK722 was actually a selected "fall out" from the firm's premium-priced hearing-aid trans
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Raytheon introduced the CK722 in early 1953 at $7.60 each; the price was reduced to $3.50 in late 1954. The CK722 was actually a selected "fall out" from the firm's premium-priced hearing-aid transistor line. This germanium PNP junction transistor was very popular with hobbyist and was featured in construction articles in magazines and books. This advertisement appeared in the April 1955 issue of the Popular Electronics.
Copyright holder
The advertisement did not have a copyright notice.