Automatic Age

DUO LOCK BATS 9 00 IN
3,000 Questionnaires Mailed to
Operators — Results Prove Duo
Locks Offer Every Feature 9 out
of 10 Operators Want!
ONLY THE
ALL THESE
DUO COMBINES
FEATURES THAT
OPERATORS WANT!
1. MASTER KEY S Y S T E M -O n e key
convenience and safety with the fa­
mous Registered Key Plan.
2. N O N -D U P L IC A T A B LE KEY— The
D uo key serratures cannot he d u p li­
cated on standard duplicating m a­
chines and blanks are not sold.
3. PICK-PROOF C O N S T R U C T I O N
— No lock made is more nearly pick-
proof than the D uo!
4. 14 TUM BLER CYLIN D ER M E C H ­
A N IS M — Not 7 — not 11 — but 14
tum blers employed in the D uo mech­
anism !
5. S T U R D Y ,C O N V E N T IO N A L -T Y P E ,
FLAT KEY -Easy to carry.
6. STRONG LOCK W ASHER A N D
C A M -B O L T — Plenty of resistance to
prying or forcing for all norm al lo­
cations.
THE
7
T
h a n k
y o u
,
o pera t o rs
!
Thank you for
your cooperation in helping us deter­
mine the lock features you judge most im­
portant. Thank you for your overwhelming
endorsement of all the features that only
the Duo Lock combines.
Actually 3,000 operators were asked to
name the lock qualities they wanted.
In 9
cases out of 10. no feature was asked for
that the Duo Lock doesn’t already provide.
Here is dramatic proof of Duo leadership!
But the Illinois Lock testing and research,
the constant effort for still better products,
has been going steadily on.
Now to meet
the unusual needs of the one operator in
ten— to insure super-safety for even the
most troublesome locations— we present a
NEW loch. A truly superb instrument.
A
lock that offers safety features unheard of
only six months ago! Read about them at
right.
ILLINOIS
7 3 7 W. Jackson Blvd.
© International Arcade Museum
http://www.arcade-museum.com/