This is an original 1927 one-page article (one single-sided page) by Paul Welker on how a radio beam was designed to direct aircrafts and ships.
This 85+ year old Item is rated Very Fine +++. No creases. No natural defects. No surface rub. No tears. No water damage.
Product Type: Original Print Article; Black / White
Grade: Very Fine +++
Dimensions: Approximately 7.5 x 10.75 inches; 19 x 27 cm
Authentication: Serial-Numbered Certificate of Authenticity w/ Full Provenance
Protection: Packaged in a custom archival sleeve with an acid-free black board (great for display, gift-giving, and preservation)