Looper threading apparatus for sewing machine
Looper throw-out mechanism for sewing machine
Looper throw-out safety catch device
Looper-cam shifting arrangement for a sewing machine
Looptaker arrangement in sewing devices
Lost motion compensation for sewing machine needle vibrating gat
Lower feed dog lifting, lowering, and horizontal coupling
Lower thread automatic supply device for a sewing machine
Lower thread supplying mechanism for a sewing machine
Lower wheel fabric feeding device in a column sewing machine