This advertisement for Kollsman appeared in Aero Digest, April, 1935:
KOLLSMAN FOR PRECISION
The 1935 Models of BEECHCRAFT are equipped with
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KOLLSMAN
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PRECISION AIRCRAFT INSTRUMENTS
• The same characteristics of accuracy, dependability and performance
which have gained a world-wide reputation for the Kollsman Sensitive
Altimeter are also inherent in all our engine and flight instruments.
KOLLSMAN INSTRUMENT COMPANY, 5 JUNIUS STREET, [...]