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new manufacturers installations collection restorations timeline identification publications glossary mailing list site map links about contact	measurement limited: advertisements actadis ripple system Published in: APLE Conference Programme, September 1938 Click here for larger scan actadis ripple system Published in: APLE Conference Programme, September 1939 Click here for larger scan ripple control Published in: APLE Conference Programme, September 1946 Published in: APLE Conference Programme, September 1947 Click here for larger scan ripple control system Published in: APLE Conference Programme, September 1948 Click here for larger scan